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Find the exact value of $\tan^{-1}(-1)$

Do not use a calculator. You may use the unit circle.

A

$0$

B

$\cfrac{\pi}{2}$

C

$-\cfrac{\pi}{2}$

D

$\pi$

E

$\cfrac{\pi}{4}$

F

$-\cfrac{\pi}{4}$

G

$\cfrac{3\pi}{4}$

H

$\cfrac{5\pi}{4}$

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