SOLUTION: Given: SinA = 77/85 and CosB = 80/89
Find: cos(A-B)
I've been trying this problem over and over and have yet to get the right answer.
Algebra ->
Trigonometry-basics
-> SOLUTION: Given: SinA = 77/85 and CosB = 80/89
Find: cos(A-B)
I've been trying this problem over and over and have yet to get the right answer.
Log On
Question 935666: Given: SinA = 77/85 and CosB = 80/89
Find: cos(A-B)
I've been trying this problem over and over and have yet to get the right answer. Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! Given: SinA = 77/85 and CosB = 80/89
Find: cos(A-B)
=====================
Find cos(A) and sin(B)
--
cos(A-B) = cos(A)cos(B) + sin(A)sin(B)
