List of integrals of logarithmic functions

List of integrals of logarithmic functions

The following is a list of integrals (antiderivative functions) of logarithmic functions. For a complete list of integral functions, see list of integrals.

"Note:" "x">0 is assumed throughout this article.

: intln cx;dx = xln cx - x

: intln (ax + b);dx = frac{(ax+b)ln(ax+b) - (ax+b)}{a}

: int (ln x)^2; dx = x(ln x)^2 - 2xln x + 2x

: int (ln x)^n; dx = xsum^{n}_{k=0}(-1)^k frac{n!ln^{n-k}x}{(n-k)!}

: int frac{dx}{ln x} = ln|ln x| + ln x + sum^infty_{k=2}frac{(ln x)^k}{kcdot k!}

: int frac{dx}{(ln x)^n} = -frac{x}{(n-1)(ln x)^{n-1 + frac{1}{n-1}intfrac{dx}{(ln x)^{n-1 qquadmbox{(for }n eq 1mbox{)}

: int x^mln x;dx = x^{m+1}left(frac{ln x}{m+1}-frac{1}{(m+1)^2} ight) qquadmbox{(for }m eq -1mbox{)}

: int x^m (ln x)^n; dx = frac{x^{m+1}(ln x)^n}{m+1} - frac{n}{m+1}int x^m (ln x)^{n-1} dx qquadmbox{(for }m eq -1mbox{)}

: int frac{(ln x)^n; dx}{x} = frac{(ln x)^{n+1{n+1} qquadmbox{(for }n eq -1mbox{)}

: int frac{ln{x^n};dx}{x} = frac{(ln{x^n})^2}{2n} qquadmbox{(for }n eq 0mbox{)}

: int frac{ln x,dx}{x^m} = -frac{ln x}{(m-1)x^{m-1-frac{1}{(m-1)^2 x^{m-1 qquadmbox{(for }m eq 1mbox{)}

: int frac{(ln x)^n; dx}{x^m} = -frac{(ln x)^n}{(m-1)x^{m-1 + frac{n}{m-1}intfrac{(ln x)^{n-1} dx}{x^m} qquadmbox{(for }m eq 1mbox{)}

: int frac{x^m; dx}{(ln x)^n} = -frac{x^{m+1{(n-1)(ln x)^{n-1 + frac{m+1}{n-1}intfrac{x^m dx}{(ln x)^{n-1 qquadmbox{(for }n eq 1mbox{)}

: int frac{dx}{xln x} = ln left|ln x ight|

: int frac{dx}{x^nln x} = ln left|ln x ight| + sum^infty_{k=1} (-1)^kfrac{(n-1)^k(ln x)^k}{kcdot k!}

: int frac{dx}{x (ln x)^n} = -frac{1}{(n-1)(ln x)^{n-1 qquadmbox{(for }n eq 1mbox{)}

: int ln(x^2+a^2); dx = xln(x^2+a^2)-2x+2a an^{-1} frac{x}{a}

: int frac{x}{x^2+a^2}ln(x^2+a^2); dx = frac{1}{4} ln^2(x^2+a^2)

: 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))

: int e^x left(x ln x - x - frac{1}{x} ight);dx = e^x (x ln x - x - ln x)

: int frac{1}{e^x} left( frac{1}{x}-ln x ight);dx = frac{ln x}{e^x}

: int e^x left( frac{1}{ln x}- frac{1}{xln^2 x} ight);dx = frac{e^x}{ln x}

References

* Milton Abramowitz and Irene A. Stegun, "Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables", 1964. A few integrals are listed on [http://www.math.sfu.ca/~cbm/aands/page_69.htm page 69] in this classic book.


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