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Prove that the following functions do no...

Prove that the following functions do not have maxima or minima:
(i) ` f(x) = e^(x)" "(ii) g(x) = log x`
`(iii) h(x) = x^(3)+x^(2)+x+1`

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(i)Given `f(x)=e^x`
differentiating w.r.t `x`
`f'(x)=e^x`
putting `f'(x)=0`
...
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NCERT ENGLISH-APPLICATION OF DERIVATIVES-EXERCISE 6.5
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