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OpenStudy (anonymous):
prove sin 90-theta as costheta
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Parth (parthkohli):
\[\textbf{HINT}\]\[\sin(a-b) = \sin(a)\cos(b) - \cos(a)\sin(b) \]
OpenStudy (anonymous):
There are lots of ways to do this. Consider this drawing: |dw:1356415042520:dw|
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