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  • Please solve RD Sharma class 12 chapter Differentiation exercise 10.2 question 17 maths textbook solution

Please solve RD Sharma class 12 chapter Differentiation exercise 10.2 question 17 maths textbook solution

Answers (1)

Answer:    \frac{-2 x}{\sqrt{1-x^{2}}\left(1+x^{2}\right)^{\frac{3}{2}}}

Hint: You must know the rules of solving derivative of polynomial function

Given: \sqrt{\frac{1-x^{2}}{1+x^{2}}}

Solution:

Let  y=\sqrt{\frac{1-x^{2}}{1+x^{2}}}

y=\left(\frac{1-x^{2}}{1+x^{2}}\right)^{\frac{1}{2}}

Differentiating with respect to x

\frac{d y}{d x}=\frac{d}{d x}\left(\frac{1-x^{2}}{1+x^{2}}\right)^{\frac{1}{2}}

\frac{d y}{d x}=\frac{1}{2}\left(\frac{1-x^{2}}{1+x^{2}}\right)^{\frac{1}{2}-1} \times \frac{d}{d x}\left(\frac{1-x^{2}}{1+x^{2}}\right)                   [ using chain rule]

\frac{d y}{d x}=\frac{1}{2}\left(\frac{1-x^{2}}{1+x^{2}}\right)^{-\frac{1}{2}} \times\left\{\frac{\left(1+x^{2}\right) \frac{d}{d x}\left(1-x^{2}\right)-\left(1-x^{2}\right) \frac{d}{d x}\left(1+x^{2}\right)}{\left(1+x^{2}\right)^{2}}\right\}\cdot \cdot \frac{d}{d x}\left(\frac{u}{v}\right)=\frac{v \frac{d u}{d x}-u \frac{d v}{d x}}{v^{2}}

\frac{d y}{d x}=\frac{1}{2}\left(\frac{1+x^{2}}{1-x^{2}}\right)^{\frac{1}{2}} \times\left\{\frac{-2 x\left(1+x^{2}\right)-2 x\left(1-x^{2}\right)}{\left(1+x^{2}\right)^{2}}\right\}

\frac{d y}{d x}=\frac{1}{2}\left(\frac{1+x^{2}}{1-x^{2}}\right)^{\frac{1}{2}} \times\left\{\frac{-2 x-2 x^{3}-2 x+2 x^{3}}{\left(1+x^{2}\right)^{2}}\right\}

\frac{d y}{d x}=\frac{1}{2}\left(\frac{1+x^{2}}{1-x^{2}}\right)^{\frac{1}{2}} \times\left\{\frac{-4 x}{\left(1+x^{2}\right)^{2}}\right\}

\frac{d y}{d x}=\frac{-2 x}{\sqrt{1-x^{2}}\left(1+x^{2}\right)^{\frac{3}{2}}}

 

Posted by

infoexpert26

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