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Differentiation Proof : Use the fact that lul = the square root of u^2 to prove that d/dx[lul] = u'(u/lul).

Let u be a differentiable function of x. Use the fact that lul = the square root of u^2 to prove that d/dx[lul] = u'(u/lul). u is not equal to zero.

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A differentiation proof is provided. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.

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