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trig

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If
cot(x) = −19/18
,
where x is in Quadrant IV, what is the exact value of sin(2x)?

  • trig -

    tan x = -18/19
    hypotenuse = sqrt (18^2+19^2)
    = sqrt (324+361)
    = sqrt(685)
    sin x = -18/sqrt(685)
    cos x = +19/sqrt(685)

    sin (2x) = 2 sin x cos x
    = -2*18*19/685

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