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find all solutions to the equation cos x = -0.901 on the interval [0,2pi).

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The trigonometric equation is .

The cosine function is negative in second and third quadrant.

In second quadrant .

General solution: If cos(θ) = cos(α), then θ = 2nπ ± α, where n is an integer.

The cosine function is negative in second and third quadrant.

The general solution is image.

answered Apr 1, 2016 by lilly Expert

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