5. Continuity and Differentiation
easy

फलन $x + \frac{1}{x},x \in [1,\,3]$ के लिए मध्यमान प्रमेय में  $c$ का मान है

A

$1$

B

$\sqrt 3 $

C

$2$

D

इनमें से कोई नहीं

Solution

(b) $f'(x) = 1 – \frac{1}{{{x^2}}} \Rightarrow f'(c) = 1 – \frac{1}{{{c^2}}}$

$\therefore 1 – \frac{1}{{{c^2}}} = \frac{{\frac{{10}}{3} – 2}}{2} $

$\Rightarrow 1 – \frac{1}{{{c^2}}} = \frac{2}{3} \Rightarrow {c^2} = 3$.

Standard 12
Mathematics

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