If anyone could help me with these it would be greatly appreciated, I really have no idea how to start.
If sinx/siny = 1/2, and cosx/cosy = 3 prove sin(x+y) = 7/3sinxcosx
and
If cosx + sinx = 2/3, find the value of sin 2x
If anyone could help me with these it would be greatly appreciated, I really have no idea how to start.
If sinx/siny = 1/2, and cosx/cosy = 3 prove sin(x+y) = 7/3sinxcosx
and
If cosx + sinx = 2/3, find the value of sin 2x