Tuesday

September 30, 2014

September 30, 2014

Posted by **Kenneth** on Sunday, January 8, 2012 at 6:45pm.

- trig -
**Steve**, Monday, January 9, 2012 at 4:56amCan't quite figure out some of the verbage, but

if A is in QII and sinA = 12/13, the cosA = -5/13

if B is in QI and cosB = 15/17, then sinB = 8/17

So,

sin(A-B) = sinAcosB - cosAsinB

= (12/13)(15/17) - (-5/13)(8/17)

= 180/221 + 40/221 = 220/221

**Answer this Question**

**Related Questions**

Pre-calc/Trig - If cot(a)=3 and sin(b)= (15/17) where a being alpha lies in ...

trig - Find cos(a=b). sin a = 3/5, a lies in Quadrant II, and cos b = 5/13, b ...

math - sin a=3/5, a lies on quadrant 1 and sin b=5/13, b lies on quadrant 2. ...

trig - Find sin è/2 for cos è = 1/4 and è lies in Quadrant I.

trig - Given that sin = 3/5 and lies in quadrant II, find the following value. ...

Trig - Find cos(s+t) if cos s= -1/2 and sin t= 3/5, s and t are in quadrant II. ...

trig - Find sin è/2 for sin è = - 3/5 and è lies in Quadrant IV

trig - Find sin è/2 for sin è = 1/4 and è lies in Quadrant I.

trig - If sin alpha = -3/5, sin beta = -5/13, P(alpha) is in the third quadrant...

trig - Given sin a = 15/17 with a in Quadrant I and cos beta = 4/5 with beta in ...