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simplify(sin^2(x/2)--1)/(4-cos^2(x/2))-1/2-(-cos^2(x/2)/(2*(4-cos^2(x/2))))
simplify(sin^2(x/2)--1)/(4-cos^2(x/2))-1/2-(-cos^2(x/2)/(2*(4-cos^2(x/2))))
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