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যোগজীকরণ নির্ণয় কর:

\int \frac{d x}{\cos x + \sin x}

\frac{1}{\sqrt{2}} \ln |\begin{matrix} \frac{\tan \frac{x}{2} - \sqrt{2} - 1}{\tan \frac{x}{2} + \sqrt{2} - 1} \end{matrix}| + C

ANS : 1

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