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What is the value of cosθ given that (−2, −3) is a point on the terminal side of θ ?

 

*  2√13 / √13

*  −2√13 / √13

*  3√13 / √13

*  −3√13 / √13

 Jul 9, 2019
 #1
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cos θ  =   x  / r

 

r  =  √ [ (-2)^2 + (-3)^2 ]  = √ [ 4 + 9 ]  = √13

 

So

 

cos θ =    -2/√13  =    -2 √13 / 13

 

 

 

cool cool cool

 Jul 9, 2019

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