упростить выражение
sin(a+b)+sin(a-b);
cos([tex]cos( \pi - \alpha )+cos3/2 \pi + \alpha [/tex]
1+2cos(-α)sin(-α)
sin(a+b)+sin(a-b);
cos([tex]cos( \pi - \alpha )+cos3/2 \pi + \alpha [/tex]
1+2cos(-α)sin(-α)
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