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    Question

    If a + b = 90° and a = 2b , then the value of 3 cos2a

    – 2 sin2b is equal to:
    A 4/3 Correct Answer Incorrect Answer
    B ¾ Correct Answer Incorrect Answer
    C 3/2 Correct Answer Incorrect Answer
    D ¼ Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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