CPM Homework Help : INT3 Problem 9-77

Calculate the value of each expression. Give an exact answer, if possible. Each angle measure is given in radians. Homework Help ✎
1. sin(4)
2. sin

Hint (a):

Make sure your calculator is in radian mode.

Hint (b):

$\text{Since }\frac{4\pi}{3} \text{ is related to the }30\degree-60\degree-90\degree\text{ angles, this one}$

$\text{has an exact answer. Locate it on the unit circle.}$

$\text{Notice that it will be a reflection (twice) of sin} \left(\frac{\pi}{3}\right).$

More Help (b):

It is in the third quadrant.

Answer (a):

−0.76