List of integrals of hyperbolic functions

Short description: Wikipedia list article

The following is a list of integrals (anti-derivative functions) of hyperbolic functions. For a complete list of integral functions, see list of integrals.

In all formulas the constant a is assumed to be nonzero, and C denotes the constant of integration.

Integrals involving only hyperbolic sine functions

[math]\displaystyle{ \int\sinh ax\,dx = \frac{1}{a}\cosh ax+C }[/math]

[math]\displaystyle{ \int\sinh^2 ax\,dx = \frac{1}{4a}\sinh 2ax - \frac{x}{2}+C }[/math]

[math]\displaystyle{ \int\sinh^n ax\,dx = \frac{1}{an}(\sinh^{n-1} ax)(\cosh ax) - \frac{n-1}{n}\int\sinh^{n-2} ax\,dx \qquad\mbox{(for }n\gt 0\mbox{)} }[/math]

also: [math]\displaystyle{ \int\sinh^n ax\,dx = \frac{1}{a(n+1)}(\sinh^{n+1} ax)(\cosh ax) - \frac{n+2}{n+1}\int\sinh^{n+2}ax\,dx \qquad\mbox{(for }n\lt 0\mbox{, }n\neq -1\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{dx}{\sinh ax} = \frac{1}{a} \ln\left|\tanh\frac{ax}{2}\right|+C }[/math]

also: [math]\displaystyle{ \int\frac{dx}{\sinh ax} = \frac{1}{a} \ln\left|\frac{\cosh ax - 1}{\sinh ax}\right|+C }[/math]

[math]\displaystyle{ \int\frac{dx}{\sinh ax} = \frac{1}{a} \ln\left|\frac{\sinh ax}{\cosh ax + 1}\right|+C }[/math]

[math]\displaystyle{ \int\frac{dx}{\sinh ax} = \frac{1}{2a} \ln\left|\frac{\cosh ax - 1}{\cosh ax + 1}\right|+C }[/math]

[math]\displaystyle{ \int\frac{dx}{\sinh^n ax} = -\frac{\cosh ax}{a(n-1)\sinh^{n-1} ax}-\frac{n-2}{n-1}\int\frac{dx}{\sinh^{n-2} ax} \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int x\sinh ax\,dx = \frac{1}{a} x\cosh ax - \frac{1}{a^2}\sinh ax+C }[/math]

[math]\displaystyle{ \int (\sinh ax)(\sinh bx)\,dx = \frac{1}{a^2-b^2} \big(a(\sinh bx)(\cosh ax) - b(\cosh bx)(\sinh ax)\big)+C \qquad\mbox{(for }a^2\neq b^2\mbox{)} }[/math]

Integrals involving only hyperbolic cosine functions

[math]\displaystyle{ \int\cosh ax\,dx = \frac{1}{a}\sinh ax+C }[/math]

[math]\displaystyle{ \int\cosh^2 ax\,dx = \frac{1}{4a}\sinh 2ax + \frac{x}{2}+C }[/math]

[math]\displaystyle{ \int\cosh^n ax\,dx = \frac{1}{an}(\sinh ax)(\cosh^{n-1} ax) + \frac{n-1}{n}\int\cosh^{n-2} ax\,dx \qquad\mbox{(for }n\gt 0\mbox{)} }[/math]

also: [math]\displaystyle{ \int\cosh^n ax\,dx = -\frac{1}{a(n+1)}(\sinh ax)(\cosh^{n+1} ax) + \frac{n+2}{n+1}\int\cosh^{n+2}ax\,dx \qquad\mbox{(for }n\lt 0\mbox{, }n\neq -1\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{dx}{\cosh ax} = \frac{2}{a} \arctan e^{ax}+C }[/math]

also: [math]\displaystyle{ \int\frac{dx}{\cosh ax} = \frac{1}{a} \arctan (\sinh ax)+C }[/math]

[math]\displaystyle{ \int\frac{dx}{\cosh^n ax} = \frac{\sinh ax}{a(n-1)\cosh^{n-1} ax}+\frac{n-2}{n-1}\int\frac{dx}{\cosh^{n-2} ax} \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int x\cosh ax\,dx = \frac{1}{a} x\sinh ax - \frac{1}{a^2}\cosh ax+C }[/math]

[math]\displaystyle{ \int x^2 \cosh ax\,dx = -\frac{2x \cosh ax}{a^2} + \left(\frac{x^2}{a}+\frac{2}{a^3}\right) \sinh ax+C }[/math]

[math]\displaystyle{ \int (\cosh ax)(\cosh bx)\,dx = \frac{1}{a^2-b^2} \big(a(\sinh ax)(\cosh bx) - b(\sinh bx)(\cosh ax)\big)+C \qquad\mbox{(for }a^2\neq b^2\mbox{)} }[/math]

[math]\displaystyle{ \int \frac{dx}{1+\cosh(ax)} = \frac{2}{a} \frac{1}{1+e^{-ax}}+C }[/math] or [math]\displaystyle{ \frac{2}{a} }[/math] times The Logistic Function

Other integrals

Integrals of hyperbolic tangent, cotangent, secant, cosecant functions

[math]\displaystyle{ \int \tanh x \, dx = \ln \cosh x + C }[/math]

[math]\displaystyle{ \int\tanh^2 ax\,dx = x - \frac{\tanh ax}{a}+C }[/math]

[math]\displaystyle{ \int \tanh^n ax\,dx = -\frac{1}{a(n-1)}\tanh^{n-1} ax+\int\tanh^{n-2} ax\,dx \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int \coth x \, dx = \ln| \sinh x | + C , \text{ for } x \neq 0 }[/math]

[math]\displaystyle{ \int \coth^n ax\,dx = -\frac{1}{a(n-1)}\coth^{n-1} ax+\int\coth^{n-2} ax\,dx \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int \operatorname{sech}\,x \, dx = \arctan\,(\sinh x) + C }[/math]

[math]\displaystyle{ \int \operatorname{csch}\,x \, dx = \ln\left| \tanh {x \over2}\right| + C = \ln\left|\coth{x}-\operatorname{csch}{x}\right|+C, \text{ for } x \neq 0 }[/math]

Integrals involving hyperbolic sine and cosine functions

[math]\displaystyle{ \int (\cosh ax)(\sinh bx)\,dx = \frac{1}{a^2-b^2} \big(a(\sinh ax)(\sinh bx) - b(\cosh ax)(\cosh bx)\big)+C \qquad\mbox{(for }a^2\neq b^2\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{\cosh^n ax}{\sinh^m ax} dx = \frac{\cosh^{n-1} ax}{a(n-m)\sinh^{m-1} ax} + \frac{n-1}{n-m}\int\frac{\cosh^{n-2} ax}{\sinh^m ax} dx \qquad\mbox{(for }m\neq n\mbox{)} }[/math]

also: [math]\displaystyle{ \int\frac{\cosh^n ax}{\sinh^m ax} dx = -\frac{\cosh^{n+1} ax}{a(m-1)\sinh^{m-1} ax} + \frac{n-m+2}{m-1}\int\frac{\cosh^n ax}{\sinh^{m-2} ax} dx \qquad\mbox{(for }m\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{\cosh^n ax}{\sinh^m ax} dx = -\frac{\cosh^{n-1} ax}{a(m-1)\sinh^{m-1} ax} + \frac{n-1}{m-1}\int\frac{\cosh^{n-2} ax}{\sinh^{m-2} ax} dx \qquad\mbox{(for }m\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{\sinh^m ax}{\cosh^n ax} dx = \frac{\sinh^{m-1} ax}{a(m-n)\cosh^{n-1} ax} + \frac{m-1}{n-m}\int\frac{\sinh^{m-2} ax}{\cosh^n ax} dx \qquad\mbox{(for }m\neq n\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{\sinh^m ax}{\cosh^n ax} dx = \frac{\sinh^{m+1} ax}{a(n-1)\cosh^{n-1} ax} + \frac{m-n+2}{n-1}\int\frac{\sinh^m ax}{\cosh^{n-2} ax} dx \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

[math]\displaystyle{ \int\frac{\sinh^m ax}{\cosh^n ax} dx = -\frac{\sinh^{m-1} ax}{a(n-1)\cosh^{n-1} ax} + \frac{m-1}{n-1}\int\frac{\sinh^{m -2} ax}{\cosh^{n-2} ax} dx \qquad\mbox{(for }n\neq 1\mbox{)} }[/math]

Integrals involving hyperbolic and trigonometric functions

[math]\displaystyle{ \int \sinh (ax+b)\sin (cx+d)\,dx = \frac{a}{a^2+c^2}\cosh(ax+b)\sin(cx+d)-\frac{c}{a^2+c^2}\sinh(ax+b)\cos(cx+d)+C }[/math]

[math]\displaystyle{ \int \sinh (ax+b)\cos (cx+d)\,dx = \frac{a}{a^2+c^2}\cosh(ax+b)\cos(cx+d)+\frac{c}{a^2+c^2}\sinh(ax+b)\sin(cx+d)+C }[/math]

[math]\displaystyle{ \int \cosh (ax+b)\sin (cx+d)\,dx = \frac{a}{a^2+c^2}\sinh(ax+b)\sin(cx+d)-\frac{c}{a^2+c^2}\cosh(ax+b)\cos(cx+d)+C }[/math]

[math]\displaystyle{ \int \cosh (ax+b)\cos (cx+d)\,dx = \frac{a}{a^2+c^2}\sinh(ax+b)\cos(cx+d)+\frac{c}{a^2+c^2}\cosh(ax+b)\sin(cx+d)+C }[/math]