Question

here is something interesting, i need help with

Answer 1

here? where?

Answer 2

if Df R and Dg R the proove that the graphs of f(x) and g(x) are symmetrical on xx

Answer 3

what is Df R and Dg R?

Answer 4

(f-g)^2(x)+4(f*g)(x)\[\le\]0