f (x) = (4x-2) ÷ (x²+1)
f '(x) = 14x^6 -6x
f (x) = (2x³ +2) (3x +2)
f '(x) = 8x^7 -44x³
f '(x) = 28x³ -2
f '(x) = 24x³ +12x² +6
f '(x) = 6x +5
f (x) = 3x² +5x +2
f (x) = 2x^7 -3x² -2
f '(x) = (12x³ -24x²) ÷ 9x^4
f '(x)= (-4x²+4x+4) ÷ (x²+1)²
f (x) = (2x² +4 ) ÷ 3x²
f (x) = 7x^4 -2x +2000
f (x) = (2x^4 -3) (5x^4 +2)