Question

Finding the exact value of trig. functions?

Answer 1

I have this I'm trying to figure out,
\[\cot (- \frac{ 5 \pi }{ 4 } )\]

Answer 2

it's \[\cot(-\frac{5}{4}\pi) = \frac{\cos(-\frac{5}{4}\pi)}{\sin(-\frac{5}{4}\pi)}\]

can you find those?

Answer 3

Wouldnt it just cancel out?

Answer 4

if by cancel out you mean will give -1 , then yeah :) remember : cos(-x) =cosx

Answer 5

Nope thats not what I meant lol
But thanks

Answer 6

yeah I figured that, my point was that \[\cos(-\frac{5}{4}\pi)=\cos(\frac{5}{4}\pi)=\frac{1}{\sqrt{2}}\]
and \[\sin(-\frac{5}{4}\pi)=-\frac{1}{\sqrt{2}}\]

Answer 7

I was thinking that the - 5/4 pi cancels out for some reason