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The terminal side of θ pases through points (8, -7)

 

What is the exact value of cos θ in simplified form?

 

a. 8√113 / 113

 

b. - 7√113 / 113

 

c. 7√113 / 113

 

d. - 8√113 / 113

 Nov 27, 2018

Best Answer 

 #1
avatar+18329 
+2

Hypotenuse of the angle  = sqrt (8^2 + (-7)^2) = sqrt(113)

    sin is opp/hyp = -7/sqrt113

    cos = adj/hyp = 8/sqrt(113)    multiply numerator and denom by sqrt(113) to get    8 * sqrt(113) / 113

 Nov 27, 2018
 #1
avatar+18329 
+2
Best Answer

Hypotenuse of the angle  = sqrt (8^2 + (-7)^2) = sqrt(113)

    sin is opp/hyp = -7/sqrt113

    cos = adj/hyp = 8/sqrt(113)    multiply numerator and denom by sqrt(113) to get    8 * sqrt(113) / 113

ElectricPavlov Nov 27, 2018

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