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  • Explain Solution R.D.Sharma Class 12 Chapter 21 Differential Equations Exercise Revision Exercise Question 33Maths Textbook Solution.

Explain Solution R.D.Sharma Class 12 Chapter 21 Differential Equations Exercise Revision Exercise Question 33Maths Textbook Solution.

Answers (1)

Answer: \mathrm{e}^{y}+\mathrm{e}^{-y}-\log |\mathrm{x}|+\frac{\mathrm{x}^{2}}{2}+\mathrm{C}

Hint: you must know the rules of solving differential equation and integrations.

Given:x\left ( e^{2y}-1 \right )dy+\left ( x^{2}-1 \right )e^{y}dx=0

Solution:x\left ( e^{2y}-1 \right )dy+\left ( x^{2}-1 \right )e^{y}dx=0

\begin{aligned} &x\left(e^{2 y}-1\right) d y=-\left(x^{2}-1\right) e^{y} d x \\ &x\left(e^{2 y}-1\right) d y=\left(1-x^{2}\right) e^{y} d x \\ &\frac{e^{2 y}-1}{e^{y}} d y=\frac{1-x^{2}}{x} d x \\ &\left(\frac{e^{2 y}}{e^{y}}-\frac{1}{e^{y}}\right) d y=\left(\frac{1}{x}-\frac{x^{2}}{x}\right) d x \\ &\left(e^{2 y-y}-e^{-y}\right) d y=\left(\frac{1}{x}-x\right) d x \end{aligned}

Integrating both sides,

\int\left(e^{y}-e^{-y}\right) d y=\int \frac{1}{x} d x-\int x d x \\ \int\left(e^{y} d y-\int e^{-y} d y=\int \frac{1}{x} d x-\int x d x\right. \\

e^{y}-\left(-e^{-y}\right)=\log |x|-\frac{x^{2}}{2}+c

\Rightarrow e^{y}+e^{-y}-\log |x|+\frac{x^{2}}{2}+c

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