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

 
 Nov 22, 2020
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Solve 3sin(x-y)sin(x+y)=0

 

Hello Guest!

 

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

               u                           v                         u                           v

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

\(\)\(y=90°-x\)

laugh  !

 
 Nov 22, 2020
edited by asinus  Nov 23, 2020

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