Answer
The functions that can have a y-value of $\frac{1}{2}$ are: sine, cosine, tangent, and cotangent.
Work Step by Step
RECALL:
(1) The range of the sine and the cosine functions is $[-1, 1]$.
(2) The range of the tangent and the cotangent function is $(-\infty, +\infty)$.
(3) The range of the secant and the cosecant function is $(-\infty, -1] \cup [1, +\infty)$.
Thus, the functions that can have a y-value of $\frac{1}{2}$ are: sine, cosine, tangent, and cotangent.
