CPM Homework Help : PC Problem 4-104

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4-104.

Find the exact value of each of the following trig expressions without using a calculator.

$\text{cos }( \frac { 7 \pi } { 6 } )$
Hint (a):
Draw a unit circle with reference angle.

$\text{sin }( \frac { 3 \pi } { 2 } )$
Hint (b):
Follow the hint in part (a).

$\text{sec }( \frac { 4 \pi } { 3 } )$
Hint (c):
$\sec(\theta)=\frac{1}{\cos(\theta)}$

$\text{tan }( \frac { 2 \pi } { 3 } )$
Hint (d):
Follow the hint in part (a).

Compute without a calculator

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