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cos (270+x) + cos (270-x) + cos (270+x) =

 Mar 20, 2017
 #1
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cos (270+x) + cos (270-x) + cos (270+x) =

 

cos(270+x)+cos(270x)+cos(270+x)

 

=sin(x)+(sin(x))+sin(x)

 

=sin(x)

 

laugh  !

 Mar 20, 2017

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