формула sinacosb-sinbcosa=sin(a-b)
= sin( (3x+2y) -(x+2y))= sin(3x+2y-x-2y)=sin2x
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формула sinacosb-sinbcosa=sin(a-b)
= sin( (3x+2y) -(x+2y))= sin(3x+2y-x-2y)=sin2x
.