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Thread: trigonometry question

  1. 10-26-2013, 04:30 AM #1
    Oliver
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    trigonometry question

    Which of the following is the value of given that ?


    (A)

    (B)

    (C)

    (D)


    Thanks!
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  2. 10-26-2013, 04:31 AM #2
    nicole
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    We know that .

    So,

    From the following trigonometric identity


    we can find the value of





    Therefore the correct answer is (A).
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  3. 10-26-2013, 04:31 AM #3
    Oliver
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    Thanks Nicole!
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