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f '(x) = 40x^9 - 6x² + 1/2
b) g(x) = (2x - 4)²
g ' (x) = 2(2x - 4)(2)
= 4(2x - 4)
= 8x - 16
c) m(x) = 4x - 3x⁻² + x⁻1/2
m'(x) = 4 + 6x⁻³ - 1/2 x⁻3/2
d) k(x) = (2x + 1)^1/2
k'(x) = 1/2 (2x + 1)⁻1/2 (2)
= 1/√(2x + 1)
e) s(x) = sin 2x
s'(x) = 2 cos 2x
f) l(x) = cos 4x
l'(x) = -4 sin 4x