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OpenStudy (anonymous):
(sec3x-cos3x)/(secx-cosx)=sec2x+1+cos2x
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OpenStudy (anonymous):
sec2x - cos2x = sec2x + 1 + cos2x -cos2x = 1 + cos2x -1 = 2cos2x cos x = -1/4 x = acos -1/4 x = 1.8235
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