SOLUTION: sin theta=2/3 cos theta<0

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Question 549261: sin theta=2/3 cos theta<0
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
sin theta=2/3 cos theta<0
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sine is + and cosine neg in Q2
cos%28t%29+=+sqrt%281+-+sin%5E2%28t%29%29+=+sqrt%281+-+4%2F9%29+=+sqrt%285%29%2F3
theta = arccos(sqrt(5)/3) in Q2
=~ 138.19 degs