Question: Let u be a differentiable function of X, in exercise 123, the following result is proved. d , r: = . 0. [fr it u

Let u be a differentiable function of X, in exercise 123, the following result is proved. d , r: = . 0. [fr \"it\" u llll N a Use this result to find the derivative of the function. h(x) = |7X|cosf4x) h '(x) = Need Help

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