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    Question

    Let 0° < t < 90°. Then which of the followings is

    true?
    A sin(t) ≠ cos (t) when t = 45° Correct Answer Incorrect Answer
    B sin(t) > cos (t) when t < 45° Correct Answer Incorrect Answer
    C sin(t) < cos (t) when t < 45° Correct Answer Incorrect Answer
    D sin(t) < cos (t) when t > 45° Correct Answer Incorrect Answer

    Solution

    When t = 45°, sin(t) = cos(t) = √2/2.   For t < 45°, sin(t) < cos(t).   For t > 45°, sin(t) > cos(t).   sin(t) < cos(t) when t < 45°

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