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    Thank you!

    Thank you!
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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 \frac{5}{cos^22x- sin^22x } given that cos4x=\frac{1}{2}?

    (A) 5
    (B) \frac{1}{2} ...
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