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    Question

    Find the value of cos 15° × cos 75° + sin 15° × sin 75°:

    B 1 Correct Answer Incorrect Answer
    C 1/2 Correct Answer Incorrect Answer
    D 3/4 Correct Answer Incorrect Answer

    Solution

    Using the identity cos(A - B) = cos A cos B + sin A sin B, cos(75° - 15°) = cos 60° = 1/2. Correct option: c

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