suppose sin(a)+cos(b)=-0.2 while sin(b)+cos(a)=1.6
What is the value ofsin (a+b)
This is a repost of this one
Next time please present it as such.
Reposts, that are presented properly are more likely to be answered than new questions from guests are.
So it is in your interest to do it properly.
I would also like to see someone answer this one.