+0  
 
0
184
1
avatar+389 

I came up with the answer as the second one.. 

Hev123  Mar 4, 2018
 #1
avatar+90968 
+1

-5pi / 4  =   -225°   =  (360 - 225)°  =  135°   =  a  45° reference angle in the second quadrant =

 

  ( -√2 / 2 , √2 / 2 )

 

 

cool cool cool

CPhill  Mar 4, 2018

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