Give the smallest two solutions of cos(8θ) = 0.7086 on [ 0,2π ).

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1 Answer

cos(8θ)=cos(0.783284)=cos(2π-0.783284=5.499901)=0.7086. 

Therefore 8θ=0.783284 and 8θ=5.499901, θ=0.0979 and 0.6875 radians approx. These are the two smallest angles.

by Top Rated User (1.1m points)

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