Question: Let u be a differentiable function of x. Assume the following result is proved. d dx [|u|] = u u |u| , u 0. Use

Let u be a differentiable function of x. Assume the following result is proved. d dx [|u|] = u u |u| , u 0. Use this result to find the derivative of the function. h(x) = |9x|cos(2x) h(x) =

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