pre-calculus

posted by Adam

tanx= -12/5 x in quadrant 2
find;
sin2x=
cos2x=
tan2x=

  1. Damon

    draw a sketch of x y axis system

    x = -5
    y = 12
    hypotenuse = 13

    sin x = 12/13
    cos x = -5/13
    tan x = -12/5
    now use 2x formulas
    for example
    sin 2x = 2 sin x cos x = 24/13 * -5/13
    = -120/169

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