Find the exact value of each trigonometric function:
1) cot 135 degrees
2) tan -30 degrees
3) cot (-pi)
show your work.
this is from trigonometry or algebra 2.
don't answer if you don't know it.

Cot 135 is the same a 1/tan 135, which is equal to 1/-1, so cot 135 is -1

tan -30 is the same as tan 330, which is - / 3

cot -π = 1 / tan π, which is 1 / 0, and you can't divide by 0, so cot -π is undefined