sin(x)/sin(y)= 1/2 cos(x)/cos(y)= 3

prove sin(x+y) = (7/3)sin(x)cos(x)

I dont know what to do with the fractions, do i solve for one and then try and put it in the equation or something?

like sin(x)= (1/2)sin(y)

Results 1 to 3 of 3

- April 3rd 2010, 10:42 AM #1

- Joined
- Mar 2010
- Posts
- 6

## another question!

sin(x)/sin(y)= 1/2 cos(x)/cos(y)= 3

prove sin(x+y) = (7/3)sin(x)cos(x)

I dont know what to do with the fractions, do i solve for one and then try and put it in the equation or something?

like sin(x)= (1/2)sin(y)

- April 3rd 2010, 11:15 AM #2
Um, yes I think so.

like sin(x)= (1/2)sin(y)

- April 3rd 2010, 01:21 PM #3

- Joined
- May 2006
- From
- Lexington, MA (USA)
- Posts
- 11,914
- Thanks
- 779