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OpenStudy (anonymous):
90º< theta <180º and cos theta=-4/5, find sin 4 theta?
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OpenStudy (anonymous):
sin4x=2sin2xcos2x \[4sinx*cosx*\cos2x=>4sinx*cosx*(2\cos^2 x-1)\]
OpenStudy (anonymous):
now just substitute the values
OpenStudy (anonymous):
Thank you so much, you rock my socks man
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