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Trigonometry

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Find the exact value of tan2(Beta) if sin(Beta) = 5/13 (Beta in Quadrant II)

  • Trigonometry -

    sin x = 5/13
    so tan x = -5/12

    tan 2x = 2tan x/(1 - tan^2 x)
    = 2(-5/12)/(1 - 25/144)
    = -120/119

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