See proof in explanation. ##(sin^2 x)/(cos^2 x + 3cosx + 2) =(1-cosx)/(2+cos x) ## Start with the left hand side: ##(1-cos^2 x)/((cos x+1)(cos x + 2)) ## ##implies ((1-cos x)(1+cos x))/((cos x+1)(cos x + 2)) =(1-cosx)/(2+cos x) ##
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