f(x) =cos²x
y' = 2*cosx*(-sinx) = (-2)*cosx*sinx
f(x)=2x² - 4x³ + 5
y' = 2*2x - 4*3x² = 4x - 12x²
f(x)=1/x² = x⁻²
y' = (-2)*x⁻³ = (-2)/x³
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f(x) =cos²x
y' = 2*cosx*(-sinx) = (-2)*cosx*sinx
f(x)=2x² - 4x³ + 5
y' = 2*2x - 4*3x² = 4x - 12x²
f(x)=1/x² = x⁻²
y' = (-2)*x⁻³ = (-2)/x³