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f(x) = 2
f'(x) = 0
f'(3) = 0
f'(6) = 0
b)
f(x) = 3x - 4
f'(x) = 3
f'(1) = 3
f'(5) = 3
c)
f(x) = 2x² - 1
f'(x) = 4x
f'(-1) = 4 × (-1) = -4
f'(2) = 4 × 2 = 8
d)
f(x) = x³
f'(x) = 3x²
f'(-2) = 3 × (-2)² = 3 × 4 = 12
f'(3) = 3 × 3² = 3 × 9 = 27