f-1(x) NOT EQUALS 1/f(x)
as compared
f(g) IS NOT f x(g)
which literally
n-1 = n1/2
Polynomial: -5x - 9 for x = -4 (2x^4 + 7x^3 + 7x^2 - 1) + (6x^4 + 6x^3 + 5x^ 2 + 7) (-3 - 9x^2 + 3x^4 - 6x^3) + (-9x^3 - 9x^2 - 6 + 9x^4)
Sweet~
Oh well.. I need to revise my maths now.