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The terminal ray of angle  β , drawn in standard position, passes through the point (−4, 3√5) . What is the value of cosβ ? Enter your answer, in simplest radical form, in the box. Cosβ = ?

 Feb 20, 2020
 #1
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(- 4, 3√5)  =  ( -4, √45)  =  (x , y)

 

cos B  = x  / r

 

r  =  √ [(-4)^2  + (√45)^2 ]  = √ [ 16 + 45 ] =  √61

 

So

 

cos B  = -4/√61  =  -4√61  / 61

 

 

cool cool cool

 Feb 20, 2020

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