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     EduGorilla 
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    (cos A + cos B)2 + (sin A  sin B)2 is equal to

    Options :-

    1. 4 cos2 
    2. 4 cos2
    3. 4 sin2
    4. 4 sin2
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Reply To: (cos A + cos B)2 + (sin A – sin B)2 is equal to….
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