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    Question

    cos A (sec A – cos A) (cot A + tan A) =

    ?
    A tan A Correct Answer Incorrect Answer
    B cot A Correct Answer Incorrect Answer
    C sec A Correct Answer Incorrect Answer
    D sin A Correct Answer Incorrect Answer

    Solution

    (cos A × sec A – cos2 A) (cot A + tan A) = (1 – cos2 A) = sin2 A(Cos A / Sin A + Sin A / Cos A) = Sin2 A × 1/Sin A Cos A = tan A

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