a) y' = 20x^4 + 14x - 3
b) y' = (6x + 2)(x² - 5 - 4x) + (3x² + 2x - 7)(2x - 4) = 6x^3 - 34x - 8
c) y' = -5sin(x) - sec^2(x)
d) y' = (14x + 3) / (5 + 4x)^2
a) y' = 20x^4 + 14x - 3
b) y' = (6x + 2)(x² - 5 - 4x) + (3x² + 2x - 7)(2x - 4) = 6x^3 - 34x - 8
c) y' = -5sin(x) - sec^2(x)
d) y' = (14x + 3) / (5 + 4x)^2