y' = (x^4+6)' * (3x+5) + (x^4+6) * (3x+5)' = 4x^3 * (3x+5) + (x^4+6) * 3 = 12x^4 + 20x^3 + 3x^4 + 18 =
= 15x^4 + 20x^3 + 18
y' = (x^4+6)' * (3x+5) + (x^4+6) * (3x+5)' = 4x^3 * (3x+5) + (x^4+6) * 3 = 12x^4 + 20x^3 + 3x^4 + 18 =
= 15x^4 + 20x^3 + 18