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Differentiate the following with respect...

Differentiate the following with respect of `x :(x^2+1)cos x`

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`y=(x^2+1)cos x`

Chain rule: `f(x)=g(x)h(x)`

`f'(x)=g'(x)h(x)+g(x)h'(x)`

`y'=2xcos x-(x^2+1)sinx`

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