If sin A = 3/5 and cos B = 24/25 and <A and <B are both in quadrant 1, what is the exact value of cos (A-B) ? Help please

Answer 1

well, you know

cosA = 4/5
sinB = 7/25
cos(A-B) = cosAcosB - sinAsinB

just plug in the numbers

Answer 2

oops that's
cos(A-B) = cosAcosB + sinAsinB