Question
यदि $f(x) = \frac{1}{{4{x^2} + 2x + 1}}$, तब इसका अधिकतम मान है
$f'(x) = 0$ रखने पर ==> $8x + 2 = 0$ ==> $x = - 1/4$.
$f''\,(x) = \frac{{ - [{{(4{x^2} + 2x + 1)}^2}8 - (8x + 2)\,2\,(4{x^2} + 2x + 1)(8x + 2)]}}{{{{(4{x^2} + 2x + 1)}^4}}}$
$f''( - 1/4) = $ ऋणात्मक, (उच्चिष्ठ का बिन्दु)
$\therefore$ $f{( - 1/4)_{{\rm{max}}{\rm{.}}}}$= $\frac{1}{{4 \times \frac{1}{{16}} - 2 \times \frac{1}{4} + 1}} = \frac{4}{3}$.
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$\left(1-x^2\right) d y=\left(x y+\left(x^3+2\right) \sqrt{1-x^2}\right) d x,-1 < x < 1$
का हल $v$ है तथा $y (0)=0$ है यदि $\int_{-\frac{1}{2}}^{\frac{1}{2}} \sqrt{1-x^2} y ( x ) dx = k \text { है, तो } k ^{-1}$ है।