CPM Homework Help : INT3 Problem 9-77

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9-77.

Calculate the value of each expression. Give an exact answer, if possible. Each angle measure is given in radians.

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

$\text{sin}( \frac { 4 \pi } { 3 } )$
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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