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The cosine of the angle is (negative or positive) 

The sine of the angle is (negative or positive) 

AngelRay  Feb 17, 2018
 #1
avatar+91097 
+1

Cosine  = x / r

 

Cosine in quadrant  II  is negative because x is negative and r is positive

 

 

Sine  =  y / r

 

Sine  in quadrant II  is negative because  y, r  are both positive 

 

 

cool cool cool

CPhill  Feb 17, 2018

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