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What is the value of cosθ given that (−2, 9) is a point on the terminal side of θ?

 


9√85/85

−9√85/85

2√85/85

−2√85/85

 Dec 8, 2017
 #1
avatar+95884 
+2

 r  =  √ [ x^2 + y^2 ]  = √ [ ( -2)^2 + 9^2 ]  = √85

 

cos θ  =  -2 / √85   =  -2√85 / 85

 

 

cool cool cool

 Dec 8, 2017

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