Asked by Han

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.
Answered by Steve
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
Answered by Han
oh ok thanks a lot for your help :D
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