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sinA + cos A = sinB + cos B হলে , A + B = ?

sinA + cos A = sinB + cos B হলে , A + B = ? Correct Answer π/2 

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sinA + cosA = sinB + cosB হলে , A + B = ?
একটি ত্রিভুজের A,B এবং C কোণের বিপরীত বাহুগুলোর দৈর্ঘ্য যথাক্রমে a,b এবং c. sinA =13,sinB=25, এবং a=3 হলে b = কত?