SOLUTION: cosx=3/5 o<x<3pi/2 find sinx,cosx, and tanx by half angle identities

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Question 590939: cosx=3/5 o
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
cosx=3/5 0 < x <3pi/2 find sinx,cosx, and tanx by half angle identities
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sin%28x%29+=+sqrt%281+-+cos%5E2%28x%29%29+=+4%2F5
Cosine is positive, --> Q1 & Q4 --> sine is +4/5 only
cos(x) is given
tan(x) = sin/cos = 4/3
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No half-angles are shown.
If you want the half-angles, look at Wikipedia, it's covered well there.