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