Question
${x^x}$ का स्थिर बिन्दु (Stationary point) है
अवकलन करने पर, $\frac{{dy}}{{dx}} = {x^x}(1 + \log x)$
$\therefore \frac{{dy}}{{dx}} = 0$==> $\log x = - 1$==>$x = {e^{ - 1}} = \frac{1}{e}$
$\therefore $ स्थिर बिन्दु $x = \frac{1}{e}$ है।
$\frac{{{d^2}y}}{{d{x^2}}} = {x^x}{(1 + \log x)^2} + {x^x}.\frac{1}{x}$
जब $x = \frac{1}{e},\;\;\frac{{{d^2}y}}{{d{x^2}}} = {\left( {\frac{1}{e}} \right)^{(1/e) - 1}} 0$
$\therefore $ $ y$ , $x = \frac{1}{e}$ पर निम्निष्ठ है
तथा न्यूनतम मान $ = {\left( {\frac{1}{e}} \right)^{1/e}} = {e^{ - 1/e}}$.
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$\tan ^{-1} \frac{x}{\sqrt{a^{2}-x^{2}}},|x| < a$