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OpenStudy (anonymous):
Please help? Given that cos(x)=⅓, find sin(90-x)
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OpenStudy (mathmale):
I'd suggest you simplify "sin (90-x)." Use the difference rule for the sine function: sin (a-b)=sin a cos b - cos a sin b. Simplify matters by assuming (at least initially) that angle x is in Quadrant I.
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