CPM Homework Help : PC Problem 4-137

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4-137.

Find the exact value of each of the following without using a calculator or your unit circle.

$\text{cos }( \frac { - 5 \pi } { 6 } )$
Answer (a):
$-\frac{\sqrt3}{2}$

$\text{tan }( \frac { 31 \pi } { 4 } )$
Answer (b):
$−1$

Compute without a calculator

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