सिद्ध कीजिए कि निम्नलिखित फलनों का उच...

सिद्ध कीजिए कि निम्नलिखित फलनों का उच्चतम या निम्नतम मान नहीं है :
(i) ` f (x) = e ^(x )`
(ii) ` g (x) = log x `
(iii) ` h (x) = x ^(3) + x ^(2) + x + 1 `

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