On Monday, January 25, 2021 at 7:16:00 AM UTC-8 ... wrote: > Is this the same as derivative(f(xp(x, y, z, t), yp(x, y, z, t), zp(x, y, > z, t), tp(x, y, z, t)) , x, 2)? > > No, it is not. Look up "Multivariable Chain rule".
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