Question

Solve on the interval (0,2π):

1+cosθ=1/2

Answer 1

1+cosθ=1/2
cosθ=1/2 -1
cosθ=-1/2

Answer 2

cos 30 = a / 2a = 1/2

So it is -30

Answer 3

And -30 would be the first solution, you just need to write it in your interval.

Answer 4

So, the first solution would be pi/6?

Answer 5

the first solution is -π/6

Answer 6

as I said, because it is equal to NEGATIVE 1/2

Answer 7

Ah, right, that makes sense. So would I use a reference angle to make it positive?

Answer 8

Making it 11pi/6?

Answer 9

Nevermind, I figured it out, thank you for your help!