Would any one tell me what is the $\partial^2U/\partial X^2$ where $$U(X,Z)=\frac{1}{W(Z)}\psi\left(\frac{X-X_c(Z)}{W(Z)},\xi(Z)\right)e^{i\phi(X,Z)}$$
What is the derivative of this function?
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calculus
ordinary-differential-equations