## anonymous one year ago What values for theta(0<= theat <= 2pi) satisfy the equation: 3sin theta = sin theta -1 a. pi/3, 5pi/3 b. 2pi/3, 4pi/3 c. pi/6, 3pi/6 7pi/6, 11pi/6 d. 7pi/6 ,11pi/6

• This Question is Open
1. geerky42

$3\sin\theta = \sin\theta - 1$Correct?

2. geerky42

Just isolate $$\sin\theta$$

3. anonymous

I worked it out to sinθ = -1/2. I'm honestly having a hard time grasping this stuff, so wondering what my next step would be?

4. geerky42

Do you have unit circle you can use?

5. anonymous

Yes

6. geerky42

OK, then find sine that equals -1/2 You should see what degrees you have as answer.

7. anonymous

240 degrees?

8. anonymous

I think I have it - is the answer B?

9. anonymous

thanks so much! If you're available, I have a lot of work to do tonight and would love help.

10. geerky42

|dw:1433290843582:dw|

11. geerky42

|dw:1433290860845:dw|

12. anonymous

I'm confused because there are a few different areas that have -1/2?

13. anonymous

What topic/area of Math is this? (Just so I'll know for future reference)