(d^2)/(dx^2)((cos(3x))/(x^2))

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d²dx² (cos(3x)x² )=−3(3x²cos(3x)−4xsin(3x)−2cos(3x))x⁴

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d²dx² (cos(3x)x² )=−3(3x²cos(3x)−4xsin(3x)−2cos(3x))x⁴

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d²dx² (cos(3x)x² )

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ddx (cos(3x)x² )=−3xsin(3x)+2cos(3x)x³
=ddx (−3xsin(3x)+2cos(3x)x³ )

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ddx (−3xsin(3x)+2cos(3x)x³ )=−3(3x²cos(3x)−4xsin(3x)−2cos(3x))x⁴
=−3(3x²cos(3x)−4xsin(3x)−2cos(3x))x⁴