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    Question

    Find the value of sin²12° + sin²78° + cos²24° +

    cos²66°.
    A 1 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    sin²12° + sin²(90° − 12°) + cos²24° + cos²(90° − 24°)
    = sin²12° + cos²12° + cos²24° + sin²24°
    = 1 + 1 = 2

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