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z(x,y,t)=a sin(ωt) sin(k/Lx*pi*x) sin(l/Ly*pi*y)

a = Amplitude

ω = Frequency

k and l are constants

Lx = Length in x direction

Ly = Length in y direction

How can I find [using an equation] the slope of the surface [ie the gradient] at any given point on the surface?

I know how to do it in the x direction and y direction independently:

dz/dx for x direction and dz/dy for y direction

But how do I combine these two things?

Thanks in Advance

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# Calculating the gradient of a surface

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