I calculated following two expressions, x1,and x2.
The results of these are
f(a) + f(b)
f(y) = f(a + b)
for each. And, I can understand the logic of this.
If I want to derive the result of x2 as f(y)=f(a)+f(b), how should I do about x2?
Isn't there other way than to write
Please teach me this.
Thank you in advance.