SOLUTION: if cos theta = -18/17 and theta is in quadrant 3, cos 2theta= ? and tan 2 theta=?

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Question 1160410: if cos theta = -18/17 and theta is in quadrant 3, cos 2theta= ? and tan 2 theta=?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if cos theta = -18/17
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No real number value for theta.
|-18/17| > 1