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OpenStudy (anonymous):
simplify (1+cos2x)/2
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OpenStudy (driftracer305):
k do u knw cos^2x + sin^2x = 1?
OpenStudy (anonymous):
1 = cos^2x + sin^2x and cos2x = cos^2x - sin^2x now in (1+cos2x)/2 substitute the values ....
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