you do if the quadrants for angles x and y were not specified ...i have to plug in the negative values of cosx and siny in the equation to get different answers
Determine Sin(x+y)
If Sinx = 4/5 Cosy = 12/13
Therefore the following is true.
sinx = 4/5
cosx = (+/-)3/5
siny = (+/-)5/12
cosy = 12/13
Angle X can be in Quadrant 1 or 2
Angle Y can be in Quadrant 1 or 4
s(x+y) = (4/5)(12/3) + (3/5)(5/12)
= 63/65
My Question is, that is this the only solution or do i have to plug in the negative values of cosx and siny in the equation to get different answers?
Thanks Alot