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## Homework Statement

Find the instantaneous velocity of f(x, y, z) = xyz, at (1, 2, 1)

## Homework Equations

## The Attempt at a Solution

I think this problem our proffesor gave us wasn't formulated correctly. The only time when we calculated instantaneous velocity was when we had a vectorial function like r(t) = x(t) i + y(t) j + z(t) k.

I tried using dw, but it doesn't work since i don't know dx, dy or dz