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     EduGorilla 
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    If cos  + cos  = a, sin + sin  = b and  is the arithmetic mean between  and , then sin 2+ cos 2 is equal to

    Options :-

    1. (a2 - b2 + 2ab)/(a2 + b2)
    2. (a - b)2/(a2 + b2)
    3. None of these
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