Solución 1
\[f(x) = -4x^{3} + 2x\]
\[f'(x) = \boxed{-12x^{2} + 2}\]
Solución 2
\[f(x) = -9x^{2} -5x\]
\[f'(x) = \boxed{-18x -5}\]
Solución 3
\[f(x) = -3x^{4} -6x + 3\]
\[f'(x) = \boxed{-12x^{3} -6}\]
Solución 4
\[f(x) = -2x^{3} -2x + 2\]
\[f'(x) = \boxed{-6x^{2} -2}\]
Solución 5
\[f(x) = 6x^{6} + 4x^{2} + 5x\]
\[f'(x) = \boxed{36x^{5} + 8x + 5}\]
Solución 6
\[f(x) = -x^{4} -3x^{2} + x\]
\[f'(x) = \boxed{-4x^{3} -6x + 1}\]
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