Math

angle theta is in the standard position and 0'=<theta=<180'. If cos theta = -2/3, find the exact value of sin theta* tan theta.

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asked by Han
  1. You know that cosθ = x/r
    In QII, x < 0 and y > 0, so we know

    x = -2
    r = 3
    so, y = √5

    Now you know that
    sinθ = √5/3

    and you now can easily figure sinθ * tanθ

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    posted by Steve
  2. oh ok thanks a lot for your help :D

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    posted by Han

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