Saturday

August 30, 2014

August 30, 2014

Posted by **stacey graham** on Friday, March 26, 2010 at 12:24am.

sin(A-B)?

- trig -
**Reiny**, Friday, March 26, 2010 at 9:04amif cosA = 1/3 in I, then sinA = √8/3 using Pythagoras

if sinB= -1/2 in IV, the cosB = √3/2

sin (A-B) = sinAcosB - cosAsinB

= (√8/3)(√3/2) - (1/3)(-1/2)

= (√24 + 1)/6

**Related Questions**

trig - find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in ...

trig - find the exact value given that cosA=(1/3) in quad I, sin B=(-1/2) in ...

Mathematics - I need help finding the exact value of sin (a + b), given that sin...

Trig - find the exact value of the expression using the provided information. ...

Trig - find the exact value of the expression using the provided information. ...

Trig - find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in...

Geometry - Draw a pair of quadrilaterals where the 1st quad. is congruent to the...

Math - Draw a pair of quadrilaterals where the 1st quad. is congruent to the 2nd...

Math - OOPS! Draw a pair of quads. where the angles of the 1st quad. are ...

TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...