2os^2*a/2-cosa упростите
2сos^2a/2-cosa=2cos^2a/2-cos^2a/2+sin^2a/2=cos^2a/2+sin^2a/2=1
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2сos^2a/2-cosa=2cos^2a/2-cos^2a/2+sin^2a/2=cos^2a/2+sin^2a/2=1