Question

If I have SinA and CosB how do I find Cos(A+B) and Sin(A+B)? (Preferably without a calculator)

Answer 1

HI!!!

Answer 2

use the "addition angle formula" but you need to find two other numbers first

Answer 3

you need \(\cos(A)\) and \(\sin(B)\)
do you know how to find them?

Answer 4

Example: Sin(a)=5/13
Cos(b)=4/5
Find the value of sin(a+b)

Answer 5

if \(\sin(A)=\frac{5}{13}\) then \(\cos(A)=\frac{12}{13}\) assuming A is in quadrant 1

Answer 6

Yes I apologize I forgot to mention that they are acute angles in the first quadrant