Question
Evaluate the following integrals:
$\int\frac{\sin(\tan^{-1}\text{x})}{1+\text{x}^2}\text{ dx}$

Answer

$\int\frac{\sin(\tan^{-1}\text{x})}{1+\text{x}^2}\text{ dx}$ Let $\tan^{-1}\text{x}=\text{t}$ $\Rightarrow\frac{1}{1+\text{x}^2}\text{ dx}=\text{dt}$ Now, $\int\frac{\sin(\tan^{-1}\text{x})}{1+\text{x}^2}\text{ dx}$$=\int\sin\text{t dt}$
$=-\cos(\text{t})+\text{C}$
$=-\cos\big(\tan^{-1}\text{x}\big)+\text{C}$

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