Posted by **Sierra** on Wednesday, November 7, 2012 at 11:27am.

Give: a=alpha B=beta

csc a= 2

pi/2<a<pi

secB=-3

pi/2<B<pi

1)find sin(a+B)

2)find tan(a-B)

3)cos B/2

4)sin a/2

- Trig -
**Steve**, Wednesday, November 7, 2012 at 11:32am
in QII,

if csc a = 2,

sin a = 1/2

cos a = -√3/2

tan a = -1/√3

if sec B = -3,

cos B = -1/3

sin B = √8/3

tan B = -√8

Now it's just plug and chug, using your sum-of-angles and half-angle formulas. Come on back if you get stuck.

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