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# if f(x)=x^2+9Y+2z^4,f'(x)=?

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It is not a function of only x- variable.
$f=x^2+9y+2z^4$
if we want to find differentiation of this function,we need partial differentiation w.r.t (x).
$\partial f/\partial x= \partial (x^2)/\partial x + \partial (9y)/\partial x +\partial (2z^4)/\partial x= 2x+0+0$
Hence, Final answer will be $2x$.

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