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    Question

    Find the value of sin²40° + sin²50° + cos²60° +

    cos²30°.
    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

    sin²40° + sin²(90° − 40°) + cos²60° + cos²(90° − 60°)
    = sin²40° + cos²40° + cos²60° + sin²60°
    = 1 + 1 = 2

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