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There is an image in here i promise 

 Apr 15, 2022
 #1
avatar+124594 
+1

Hard to see this but I guess you want to prove that the left side = the right side....if so....

 

cos (pi/2 - x)  =

 

cos (pi/2) cos (x)  + sin (pi/2) sin (x)  =

 

0 *  cos (x)  +  1 * sin (x)   =

 

sin x

 

cool cool cool

 Apr 15, 2022

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