Ryan L.

asked • 07/14/18

Suppose the θ is an acute angle and cosθ = 4/5. Using the results sin2x = 1/2*(1 - cos2x) and cos2x = 1/2*(1 + cos2x), find the exact values of cos1/2θ, sin1

Suppose the θ is an acute angle and cosθ = 4/5. 
 
Using the results sin2x = 1/2*(1 - cos2x) and cos2x = 1/2*(1 + cos2x),
 
find the exact values of cos1/2θ, sin1/2θ, and tan1/2θ 

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