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Integration of csc^2(9x)dx​

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\displaystyle \int csc^2(9x) dx \\\\=\frac 19\displaystyle \int \csc^2 u ~du~~~~~~~;\left[\text{Let}~u= 9x \implies dx = \frac{du}9\right]\\\\=-\frac 19 \cot u + C\\\\=-\frac 19 \cot(9x)+C

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