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    Question

    Find the value of sin265o +

    sin225o + cos235o + cos255o.
    B 1 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    sin265o + sin225o + cos235o + cos255o Using sin(90o – x) = cosx and vice versa sin265o + sin2 (90o – 65o) + cos235o + cos2(90o – 35o) = sin265o + cos265o + cos235o + sin235o = 1 + 1 = 2 (since, sin2x + cos2x = 1)

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