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Find the rate of at which the function f...

Find the rate of at which the function `f(x)=x^4-2x^3+3x^2+x+5` changes with respect to `x`.

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`f(x)=x^4-2x^3+3x^2+x+5`

`f'(x)=(d(f(x)))/(dx)`

`f'(x)=4x^3-6x^2+6x+1`

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