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Solve 3sin(x-y)sin(x+y)=0

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\(3sin(x-y)sin(x+y)=0\\ 3(sin(x)cos(y)-cos(x)sin(y))(sin(x)cos(y)+cos(x)sin(y))=0 \)

               u                           v                         u                           v

\(3(u-v)(u+v)=0\\ 3(u^2-v^2)=0\\ u^2=v^2\\ u=v\)

\(\)\(y=90°-x\)

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