Question

Find all solutions of the given equation. (enter your answers as a comma-separated list. let k be any integer. round terms to two decimal places where appropriate.) cos θ + 1 = 0

Answer 1

θ = 6.28k +3.14

Explanation:

cos(θ) is -1 for θ = π and multiples of 2π added to that.

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The answer above rounds π and 2π as requested by the problem statement. Those values are only valid for small values of k. (I suppose it might be reasonable to argue that no rounding is appropriate.)