## anonymous 5 years ago Given sin x =-1/2 with x in quadrant 3 and tan y =4/3 with y in quadrant 1, find the exact value of sin(x-y).

1. anonymous

incomplete info

2. anonymous

thats all the question gives me

3. anonymous

I'm stumped. I don't know if x and y are sides of triangle or angles

4. anonymous

$actually x=\alpha and y=\beta$

5. anonymous

can't figure out what you just wrote

6. anonymous

$x=\alpha$ and $y=\beta$

7. anonymous

OK, choice of variables made the question confusing. I got it now. Got to go to class will attempt later.

8. anonymous

okay appreciate it!

9. anonymous

Recall sin (A - B) = Sin A cos B - cos A sin B Use sin A= -1/2 in 3rd quadrant to find cos A Use tan B =4/3 in 1st to find sin of B, cos B Use exact values (no calculator, keep square roots etc) to find above