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OpenStudy (anonymous):
rewrite expression using double angle formula 10cos^2x-5
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OpenStudy (anonymous):
You factor out a 5 so that it's 5(2cos^2 x-1) And the double formula for cos is co2x = 2cos^2 x - 1 So it'd be 5(cos2x)
OpenStudy (anonymous):
cos2x*
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