Find the value of sin (a+b) if tan a= -3/4, cotb=4/3 Sina>0 and Cosb<0

Thxs

let's settle the values...

sin a = 3/5

cos b = - 4/5

sin b = - 3/5

cos a = - 4/5

sin (a + b) = sin a cos b + cos a sin b

can you complete the calulation ? go for it !

qed

[sin (a + b) = 0]