Finding derivatives of a multivariable function means we’re going to take the derivative with respect to one variable at a time. For example, we’ll take the derivative with respect to x while we treat y as a constant, then we’ll take another derivative of the original function, this one with respect to y while we treat x as a constant.

Read MoreWhenever you're dealing with a multivariable function, the graph of that function will be a three-dimensional figure in space.

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