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    Question

    If cos4 p - sin4 p =

    src="https://static.ixambee.com/public/images/quesimg/Question Bank/Quantitative Aptitude/Trigonometry/86670_5335457.gif" alt="" /> , then the value of 2 cos2 p - 1 is
    A 2/5 Correct Answer Incorrect Answer
    B 3/4 Correct Answer Incorrect Answer
    C 5/13 Correct Answer Incorrect Answer
    D √3 Correct Answer Incorrect Answer

    Solution

    cos4 p - sin4 p = (cos2 p + sin2 p)(cos2 p - sin2 p) = (cos2 p - sin2 p) = cos2 p - (1-cos2 p) = 2 cos2 p-1 =

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