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9-138.

What is the exact value for each of the following trig expressions? For parts (g) and (h), assume that $0\leθ<2\pi$ .

Hint:

Refer to problem 9-111.

cos $( \frac { 3 \pi } { 4 } )$
Answer (a):
$-\frac{\sqrt{2}}{2}$

tan $( \frac { 4 \pi } { 3 } )$

sin $( \frac { 11 \pi } { 6 } )$
Answer (c):
$-\frac{1}{2}$

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

tan $( \frac { 5 \pi } { 4 } )$
Answer (e):
$1$

tan $( \frac { 17 \pi } { 6 } )$

$\text{tan}^{–1}\left(1\right)$
Partial Answer (g):
$\frac{\pi}{4}$

$\text{tan}^{–1}\left(–1\right)$

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