Suspected mistake in solution for 10.7.1(69) in Precalculus v3, repeated in Precalculus v4

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Suspected mistake in solution for 10.7.1(69) in Precalculus v3, repeated in Precalculus v4

MarkAU
Hello Carl,

I refer to problem 10.7.1(69) on page 875 in Precalculus v3, which has been repeated as problem 11.4.2(69) on page 1016 in Precalculus v4.

In both books, the stated solution to this problem is: [pi, 2pi].

Shouldn't the solution be: {0} <union> [pi, 2pi]?