sin^2*x/2-cos^2*x/2 Упростить выражение
sin^2*x/2-cos^2*x/2=(1-cosx/2)-(1+cosx/2)=(1-cosx-1-cosx)/2=(-2cosx)/2= -cosx
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sin^2*x/2-cos^2*x/2=(1-cosx/2)-(1+cosx/2)=(1-cosx-1-cosx)/2=(-2cosx)/2= -cosx