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# Math formulas:Integrals of logarithmic functions

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### List of integrals involving logarithmic functions

 $$\int \ln(cx)dx = x\ln(cx) - x$$
 $$\int \ln(ax+b)dx = x\ln(ax+b) - x + \frac{b}{a}\ln(ax + b)$$
 $$\int (\ln x)^2dx = x(\ln x)^2 - 2x\ln x + 2x$$
 $$\int (\ln (cx))^ndx = x(\ln x)^n - n\cdot\int (\ln (cx))^{n-1}dx$$
 $$\int \frac{dx}{\ln x} = \ln|\ln x|+\ln x+\sum\limits_{n=2}^\infty\frac{(\ln x)^i}{i\cdot i!}$$
 $$\int \frac{dx}{(\ln x)^n} = -\frac{x}{(n-1)(\ln x)^{n-1}} + \frac{1}{n-1} \int \frac{dx}{(\ln x)^{n-1}}$$
 $$\int x^m \cdot \ln xdx = x^{m+1}\left(\frac{\ln x}{m+1}-\frac{1}{(m+1)^2} \right) \quad ( \text{fot } m\ne1)$$
 $$\int x^m \cdot (\ln x)^ndx = \frac{x^{m+1}(\ln x)^n}{m+1} - \frac{n}{m+1}\int x^m(\ln x)^{n-1}dx \quad (\text{for } m \ne 1)$$
 $$\int \frac{(\ln x)^n}{x}dx = \frac{(\ln x)^{n+1}}{n+1}, \quad(\text{for } n\ne 1)$$
 $$\int \frac{\ln x^n}{x}dx = \frac{\left(\ln x^n \right)^2}{2n},\quad (\text{for } n \ne 0 )$$
 $$\int \frac{\ln x}{x^m}dx = -\frac{\ln x}{(m-1)x^{m-1}}-\frac{1}{(m-1)^2x^{m-1}},\quad(\text{fot }m\ne1)$$
 $$\int \frac{(\ln x)^n}{x^m}dx = -\frac{(\ln x)^n}{(m-1)x^{m-1}} + \frac{n}{m-1}\int\frac{(\ln x)^{n-1}}{x^m}dx,\quad(\text{fot }m\ne1)$$
 $$\int \frac{dx}{x\cdot \ln x} = \ln|\ln x|$$
 $$\int \frac{dx}{x^n\cdot \ln x} = \ln|\ln x| + \sum\limits_{i=1}^\infty(-1)^i \frac{(n-1)^i(\ln x)^i}{i\cdot i!}$$
 $$\int \frac{dx}{x(\ln x)^n} = -\frac{1}{(n-1)(\ln x)^{n-1}},\quad(\text{for }n\ne 1)$$
 $$\int \ln(x^2 + a^2)dx = x\,\ln(x^2 + a^2) - 2x + 2a\,\arctan\frac{x}{a}$$
 $$\int \sin(\ln x)dx = \frac{x}{2}(\sin(\ln x)-\cos(\ln x))$$
 $$\int \cos(\ln x)dx = \frac{x}{2}(\sin(\ln x) + \cos(\ln x))$$