Question

If cos α =1/7, and cos β = 13/14, where α, β are
acute angels, show that α-β = 60°
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Answer 1

Answer:

We are given cos P = 17 & cos Q = 1314 So, we know thta sin^2 theta + cos^2 theta = 1 costheta = √(1 - sin^2theta) or sintheta = √(1 - cos^2theta