+0  
 
+1
254
1
avatar+79 


 

Steps on how to do this would be massively appreciated... 

UpTheChels  Nov 22, 2017
 #1
avatar+88980 
+2

cos ( θ + 3pi/2)  = sin θ 

 

We can use this identity to prove this

 

cos (A + B)  =  cosA*cosB - sinA*sinB

 

So we have

 

cosθ *cos 3pi/2  -  sinθ * sin(3pi/2) 

 

cosθ (0)  -  sinθ (-1)  

 

0   + sinθ  

 

sinθ

 

 

cool cool cool

CPhill  Nov 22, 2017

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