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أثبت أن المعادلة الآتية تمثل متطابقة :

2 sin 2 θ1 sinθcosθ = secθ+cscθ cscθsecθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaikdaciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaa ikdaaaGccqaH4oqCcqGHsislcaaIXaaabaGaci4CaiaacMgacaGGUb GaeqiUdeNaeyOeI0Iaci4yaiaac+gacaGGZbGaeqiUdehaaiabg2da 9maalaaabaGaci4CaiaacwgacaGGJbGaeqiUdeNaey4kaSIaci4yai aacohacaGGJbGaeqiUdehabaGaci4yaiaacohacaGGJbGaeqiUdeNa ci4CaiaacwgacaGGJbGaeqiUdehaaaaa@5D18@    
2 sin 2 θ1 sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaikdaciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaa ikdaaaGccqaH4oqCcqGHsislcaaIXaaabaGaci4CaiaacMgacaGGUb GaeqiUdeNaeyOeI0Iaci4yaiaac+gacaGGZbGaeqiUdehaaaaa@4928@                      
 
sin 2 θ1 cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGPbGaaiOBamaaCaaaleqabaGaaGOmaaaa kiabeI7aXjabgkHiTiaaigdaaeaaciGGJbGaai4BaiaacohacqaH4o qCaaaaaa@42F1@ =    
 

sin 2 θ 1 sinθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaaikdaaaGccqaH4oqC cqGHIaYTdaWcaaqaaiaaigdaaeaaciGGZbGaaiyAaiaac6gacqaH4o qCaaaaaa@438E@

=      

sinθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGZbGaaiyAaiaac6gacqaH4oqCaaa@3BBD@

=      
         
secθ+cscθ cscθsecθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXjabgUcaRiGacoga caGGZbGaai4yaiabeI7aXbqaaiGacogacaGGZbGaai4yaiabeI7aXj GacohacaGGLbGaai4yaiabeI7aXbaaaaa@4A19@      
 
secθ cscθ + cscθ secθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXbqaaiGacogacaGG ZbGaai4yaiabeI7aXbaacqGHRaWkdaWcaaqaaiGacogacaGGZbGaai 4yaiabeI7aXbqaaiGacohacaGGLbGaai4yaiabeI7aXbaaaaa@4A29@ =    
 

1+tanθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8ecaaIXaGaey4kaSIaciiDaiaacggacaGGUbGaeqiUdehaaa@3D53@

=    
 

sinθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGZbGaaiyAaiaac6gacqaH4oqCaaa@3BBD@

=      
الطرفان متساويان        
2 sin 2 θ1 sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaikdaciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaa ikdaaaGccqaH4oqCcqGHsislcaaIXaaabaGaci4CaiaacMgacaGGUb GaeqiUdeNaeyOeI0Iaci4yaiaac+gacaGGZbGaeqiUdehaaaaa@4928@                      
 
sin 2 θ1 cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGPbGaaiOBamaaCaaaleqabaGaaGOmaaaa kiabeI7aXjabgkHiTiaaigdaaeaaciGGJbGaai4BaiaacohacqaH4o qCaaaaaa@42F1@ =    
 

cos 2 θ cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacogacaGGVbGaai4CamaaCaaaleqabaGaaGOmaaaa kiabeI7aXbqaaiGacogacaGGVbGaai4CaiabeI7aXbaaaaa@4144@

=      

cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGJbGaai4BaiaacohacqaH4oqCaaa@3BB8@

=      
         
secθ+cscθ cscθsecθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXjabgUcaRiGacoga caGGZbGaai4yaiabeI7aXbqaaiGacogacaGGZbGaai4yaiabeI7aXj GacohacaGGLbGaai4yaiabeI7aXbaaaaa@4A19@      
 
secθ cscθ + cscθ secθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXbqaaiGacogacaGG ZbGaai4yaiabeI7aXbaacqGHRaWkdaWcaaqaaiGacogacaGGZbGaai 4yaiabeI7aXbqaaiGacohacaGGLbGaai4yaiabeI7aXbaaaaa@4A29@ =    
 

1+tanθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8ecaaIXaGaey4kaSIaciiDaiaacggacaGGUbGaeqiUdehaaa@3D53@

=    
 

cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGJbGaai4BaiaacohacqaH4oqCaaa@3BB8@

=      
الطرفان متساويان        
2 sin 2 θ1 sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaikdaciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaa ikdaaaGccqaH4oqCcqGHsislcaaIXaaabaGaci4CaiaacMgacaGGUb GaeqiUdeNaeyOeI0Iaci4yaiaac+gacaGGZbGaeqiUdehaaaaa@4928@                      
 
2 sin 2 θ( sin 2 θ+ cos 2 θ) sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaikdaciGGZbGaaiyAaiaac6gadaahaaWcbeqaaiaa ikdaaaGccqaH4oqCcqGHsislcaGGOaGaci4CaiaacMgacaGGUbWaaW baaSqabeaacaaIYaaaaOGaeqiUdeNaey4kaSIaci4yaiaac+gacaGG ZbWaaWbaaSqabeaacaaIYaaaaOGaeqiUdeNaaiykaaqaaiGacohaca GGPbGaaiOBaiabeI7aXjabgkHiTiGacogacaGGVbGaai4CaiabeI7a Xbaaaaa@55A5@ =    
 

sin 2 θ cos 2 θ sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGPbGaaiOBamaaCaaaleqabaGaaGOmaaaa kiabeI7aXjabgkHiTiGacogacaGGVbGaai4CamaaCaaaleqabaGaaG OmaaaakiabeI7aXbqaaiGacohacaGGPbGaaiOBaiabeI7aXjabgkHi TiGacogacaGGVbGaai4CaiabeI7aXbaaaaa@4D2D@

=      
(sinθcosθ)(sinθ+cosθ) sinθcosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaacIcaciGGZbGaaiyAaiaac6gacqaH4oqCcqGHsisl ciGGJbGaai4BaiaacohacqaH4oqCcaGGPaGaaiikaiGacohacaGGPb GaaiOBaiabeI7aXjabgUcaRiGacogacaGGVbGaai4CaiabeI7aXjaa cMcaaeaaciGGZbGaaiyAaiaac6gacqaH4oqCcqGHsislciGGJbGaai 4BaiaacohacqaH4oqCaaaaaa@57F2@ =    
 

sinθ+cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGZbGaaiyAaiaac6gacqaH4oqCcqGHRaWkciGGJbGaai4Baiaa cohacqaH4oqCaaa@4128@

=      
         
secθ+cscθ cscθsecθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXjabgUcaRiGacoga caGGZbGaai4yaiabeI7aXbqaaiGacogacaGGZbGaai4yaiabeI7aXj GacohacaGGLbGaai4yaiabeI7aXbaaaaa@4A19@      
 
secθ cscθsecθ + cscθ cscθsecθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiGacohacaGGLbGaai4yaiabeI7aXbqaaiGacogacaGG ZbGaai4yaiabeI7aXjGacohacaGGLbGaai4yaiabeI7aXbaacqGHRa WkdaWcaaqaaiGacogacaGGZbGaai4yaiabeI7aXbqaaiGacogacaGG ZbGaai4yaiabeI7aXjGacohacaGGLbGaai4yaiabeI7aXbaaaaa@5325@ =    
 

1 cscθ + 1 secθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8edaWcaaqaaiaaigdaaeaaciGGJbGaai4CaiaacogacqaH4oqCaaGa ey4kaSYaaSaaaeaacaaIXaaabaGaci4CaiaacwgacaGGJbGaeqiUde haaaaa@42A3@

=    
 

sinθ+cosθ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4HqaqFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbiWaaaxbaWYbaG 8eciGGZbGaaiyAaiaac6gacqaH4oqCcqGHRaWkciGGJbGaai4Baiaa cohacqaH4oqCaaa@4128@

=      
الطرفان متساويان        
            
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