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OpenStudy (anonymous):
sinθ=-9/10, θ is in quad IV, find sin and cos of 2θ
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OpenStudy (loser66):
why do you post it twice?
OpenStudy (anonymous):
i didn't mean to
OpenStudy (loser66):
\(cos 2\theta = 1-2sin^2 \theta\) just plug the number in to get cos \(2\theta\)
OpenStudy (loser66):
about sin \(2\theta\) there are 2 easiest way to figure out, 1/ algebraic way 2/geometric way pick one
OpenStudy (loser66):
However, I guide you only, I don't work for you and I don't force you study. If you don't want to study, it's FINE to me
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OpenStudy (anonymous):
I am working on it. . .
OpenStudy (anonymous):
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