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    Question

    Find the value of sin²10° + sin²80° + cos²15° +

    cos²75°.
    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

    sin²10° + sin²(90° − 10°) + cos²15° + cos²(90° − 15°)
    = sin²10° + cos²10° + cos²15° + sin²15°
    = 1 + 1 = 2

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