The Other Trigonometric Functions · Review Exercise 124

Use reference angles to evaluate the given expression.

If $\text{cos}\left(t\right)=\frac{\sqrt{2}}{2},$ find $\text{sin}\left(t+2\pi \right).$ There are two possible solutions.

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §7.4 The Other Trigonometric Functions · Review Exercise 124