Find -2pi/3 in standard position and find it's reference angle in degrees and radians.

Question

I really need help with these three problems, I can't figure them out. Thank you so much.

Answer 1

(1)

Reference angle of .

Convert Radians into degrees is

Find reference angle.

Reference angle of is

Answer 2

(2)

Apply Pythagorean theorem then

In the Sin function is negative and Cos function is positive.

Answer 3

(3)

Graph the equation is .