CPM Homework Help : A2C Problem 8-91

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8-91.

Calculate the value of each expression below. Each measure is given in radians.

$\operatorname{sin}\left(4\right)$
Hint (a):
Make sure your calculator is in radian mode.
Answer (a):
$−0.76$

$\operatorname { sin } ( \frac { 4 \pi } { 3 } )$
Hint (b):
$\text{Since }\frac{4\pi}{3} \text{ is related to the }30^{\circ}-60^{\circ}-90^{\circ}\text{ angles, this one}$
$\text{has an exact answer. Locate it on the unit circle.}$
$\text{Notice that it will be a reflection (twice) of sin} \left(\frac{\pi}{3}\right).$
More Help (b):
It is in the third quadrant.

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