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Proof: sin(a+b) = (cos a)(sin b) + (sin a)(cos b) https://www.youtube.com/watch?v=zw0waJCEc-w ------------------------- يتناول هذا الفيديو اثباتاً لقانون جيب أ+ب --------------------------- شكر خاص لمؤسسة شركاء في التنمية المستدامة -- فلسطين http://psdpal.org