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INTEGRALS — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsINTEGRALS3 Marks
Question
Evaluate the following definite integrals:
$\int_{0}^\limits{1}\frac{1}{\sqrt{1+\text{x}}-\sqrt{\text{x}}}\text{ dx}$
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Answer

Let $\text{I}=\int_{0}^\limits{1}\frac{1}{\sqrt{1+\text{x}}-\sqrt{\text{x}}}\text{ dx}$ Then,
$\text{I}=\int_{0}^\limits{1}\bigg(\frac{1}{\sqrt{1+\text{x}}-\sqrt{\text{x}}}\times\frac{\sqrt{1+\text{x}}+\sqrt{\text{x}}}{\sqrt{1+\text{x}}+\sqrt{\text{x}}}\bigg)\text{dx}$
$\Rightarrow\text{I}=\int_{0}^\limits{1}\frac{\sqrt{1+\text{x}}-\sqrt{\text{x}}}{1+\text{x}-\text{x}}\text{ dx}$
$\Rightarrow\text{I}=\int_{0}^\limits{1}\Big({\sqrt{1+\text{x}}+\sqrt{\text{x}}}\Big)\text{dx}$
$\Rightarrow\text{I}=\Big[\frac{2}{3}(1+\text{x})^{\frac{3}{2}}+\frac{2}{3}\text{x}^{\frac{3}{2}}\Big]^1_0$
$\Rightarrow\text{I}=\frac{2}{3}\times2\sqrt{2}+\frac{2}{3}-\frac{2}{3}$
$\Rightarrow\text{I}=\frac{4\sqrt{2}}{3}$

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