## Algebra and Trigonometry 10th Edition

$$-2.74$$
Before doing this problem, we check that out calculator is in the correct units. Thus, if the angle is listed in degrees, we put the calculator in degrees, and if the angle is listed in radians (with no degree mark), we put the calculator in radians. Doing this, we plug the value into the calculator to find that the answer is: $$-2.74$$