Evaluate the following integrals: 9- x^2 dx - Vidyadip

Question

Evaluate the following integrals:
$\int\sqrt{9-{\text{x}^2}}\text{dx}$

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Answer

Let $\text{I}=\int\sqrt{3^2-{\text{x}^2}}$
We know that,
$\int\sqrt{\text{a}^2-\text{x}^2}=\frac{\text{x}}{2}\sqrt{\text{a}^2-\text{x}^2}+\frac{\text{a}^2}{2}\sin^{-1}\frac{\text{x}}{\text{a}}+\text{C}$
$\therefore\ \text{I}=\frac{\text{x}}{2}\sqrt{9-\text{x}^2}+\frac{9}{2}\sin^{-1}\frac{\text{x}}{3}+\text{C}$

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