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    Question

    The minimum value of 45 sin2 θ + 28

    cos2 θ is
    A 28 Correct Answer Incorrect Answer
    B 39 Correct Answer Incorrect Answer
    C 14 Correct Answer Incorrect Answer
    D 12 Correct Answer Incorrect Answer

    Solution

    The minimum  value of  asin 2 θ + bcos 2 θ  is   =  Lesser value between a & b. So the minimum  value of  45 sin 2 θ + 28 cos 2 θ  is  = Lesser value between  45 & 28 = 28

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