Question

Find all solutions to the equation:
cos x = -(1/2)

Answer 1

u wanna solve it right?

Answer 2

first tell me which value of cos(theta) is -1/2

Answer 3

@sidsiddhartha find all solutions, yeah.. hold on let me show you the answer choices

Answer 4

60 deg or pi/3?

Answer 5

no, do u know which value of cos(theta) in angle produces -1/2?

Answer 6

thats what i thought it was

Answer 7

bc its negative its in the 2nd quadrant i thought, and then the theta is across from 60
@sidsiddhartha

Answer 8

Negative cosines happen only in the second and third quadrants.

Answer 9

right?

Answer 10

yeah, its in the second right?

Answer 11

so first of all
cos(180-60)=cos120=-1/2
ok?