Question

Find the exact value of the trigonometric function.

cot(-5π/4)

A. -1
B. -√2
C. 1
D. -√2/2

Answer 1

are you doing trig I assume?

Answer 2

YES

Answer 3

IS IT A

Answer 4

\[\tan (-5\pi/4)=-\tan(5\pi/4)=-\tan(\pi/4)=-1 >>>> \cot(-5\pi/4)=1/\tan(-5\pi/4)=1/-1=-1\]

Answer 5

ok, then check your Unit Circle :), for \(\cfrac{5\pi}{4}\) counterclockwise, that is, going BELOW 0, rather than ABOVE 0

Answer 6

so it's A

Answer 7

ok thanks guys @ikarus1991 @jdoe0001

Answer 8

yw

Answer 9

actually, it was supposed to be clockwise, but anyhow :|