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The terminal ray of angle β, drawn in standard position, passes through the point (−7, 2√3) .

What is the value of cosβ?

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

 May 1, 2020
 #1
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+1

cos B  =   x  / r

 

r  = √ [ (-7)^2  + (2√3)^2 ]  =  √ [ 49+ 12]  = √61

 

So

 

cos B  =  -7  /√61   =   -7√61/ 61

 

 

cool cool cool

 May 1, 2020

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