Question

What values for theta(0≤theta≤2pi) satisfy the equation?

Answer 1

@mathway

Answer 2

Why don't you factor cos theta? :)

Answer 3

If i factor cos theta i would get costheta(2sintheta+1)

Answer 4

then
cos theta=0
2sintheta+1=0

Answer 5

Yes, then you would have two solutions, right?

Answer 6

ye

Answer 7

Oh, yes, you're right.

Answer 8

I'm stuck at this part ;-;

Answer 9

my textbook says use the unit circle but how??!

Answer 10

You can still work on 2sintheta+1=0.

Answer 11

it becomes sintheta=-1/2

Answer 12

x.x

Answer 13

Right so take a look at a unit circle.

Answer 14

:O

Answer 15

First, find where cos theta=0.

Answer 16

so costheta=0 is the line in the middle?

Answer 17

Yes. They are pi/2 and 3pi/2.

Answer 18

Then, find where sin theta =-1/2.

Answer 19

hmm