If X and Y are in second quadrant and since X = 5/13 ,tan Y =_3/4 then answer the following?
CosX= ?
CosY =?
Sin(x+y)=?
Cos (x-y)=
Answers
Answered by
0
Step-by-step explanation:
cosx 12/ 13
cos y 4/5
sin(X+y) = sinx cosy + cosxsiny
= 5/13×4/5+ 12/13×3/5
= 56/65
cos ( X-y) = cos X cosy + sinx siny
63/65
Similar questions