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The terminal ray of angle β, drawn in standard position, passes through the point (−5, 2√7).

What is the value of cosβ?

Enter your answer, in simplest radical form, in the box.

 

cosβ

 Mar 2, 2021
 #1
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2sqrt (7) =  sqrt (28)

 

r =  sqrt  [ 5^2  + (sqrt (28))^2 ]  = sqrt  [ 25 + 28 ]  =  sqrt (53)

 

This is an angle in  Q2.....the cos  is  negative here....so.....

 

cos B  =  -5 / sqrt (53)  =  -5sqrt (53) / 53

 

 

cool cool cool

 Mar 2, 2021

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