$$f^{\prime }\left(x\right)=\frac{df}{dx}{\nabla }^{2}f\left(x\right)=\frac{{\partial }^{2}f}{\partial {\mathbf{x}}^2}$$ $$h^{‴}\left(\Psi \left(x\right)\right)=\frac{{\partial }^3}{\partial x^3}\left(\frac{sin\left(x\right)+4x^3}{cos\left(x^3\right)-4x}\right)$$

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