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Thread: Trigonometry double angle formula

  1. #1
    Junior Member
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    Trigonometry double angle formula

    Trigonometry double angle formula SAT Subject test Math level 2

    Which of the following is the value of given that ?

    (A)
    (B)
    (C)
    (D)
    (E)

    Thanks!

  2. #2
    The double angle formula is given by


    So, .

    Finally the required value is

    Therefore the correct answer is (E).

  3. #3
    Junior Member
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    Thank you!

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