# What does it mean to find the sign of a trigonometric function and how do you find it?

It means to determine if the value of a trigonometric function is positive or negative; for example, since $\sin \left(\frac{3 \pi}{2}\right) = - 1 < 0$, its sign is negative, and since $\cos \left(- \frac{\pi}{3}\right) = \frac{1}{2} > 0$, its sign is positive.