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= 2x² - 3x
f'(x) = 4x-3
3) f(x) = (⅓x³ + x² + x)-(3/5 x⁴ -2x²)
= ⅓x³ + x² + x - 3/5x⁴ +2x²
= -3/5x⁴ + ⅓x³ + 3x² + x
f'(x) = -12/5x³ + x² + 6x + 1