Question

Find `f@g` and `g@f` ,if they exist,for the functions `f(t)=4t,t∈RR,g(x,y)=x+y,x,y∈RR`?

Answer 1

See below.

Explanation:

`f@g = f(g) = 4g rArr (f@g)(x,y) = 4(x+y)`

Now

`g@f` has no sense.