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Trig

 Apr 25, 2019
 #1
avatar+101151 
+2

cos 2a  =  cos a * cos a -  sin a  * sin a   =   

 

cos^2a - sin^2a  = (1 - sin^2 a) - sin^2 a  = 1 - 2sin^2 a

 

So...

 

True   !!!!

 

 

cool cool cool

 Apr 25, 2019
 #2
avatar+315 
+1

Thank you!! Awesome as always! smiley

Cupcake  Apr 25, 2019

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