Cesko.wiki Seznam integrálů trigonometrických funkcí
Author
Albert FloresToto je seznam integrálů (primitivních funkcí) pro integrandy obsahující trigonometrické funkce.
Předpokládá se nenulová hodnota konstanty c.
Integrály obsahující sin
Kde c je konstanta:
: \int\sin cx\;\mathrm{d}x = -\frac{1}{c}\cos cx\,\!
: \int\sin^n {cx}\;\mathrm{d}x = -\frac{\sin^{n-1} cx\cos cx}{nc} + \frac{n-1}{n}\int\sin^{n-2} cx\;\mathrm{d}x \qquad\mbox{(pro }n>0\mbox{)}\,\!
: \int\sqrt{1 - \sin{x}}\,\mathrm{d}x = \int\sqrt{\operatorname{cvs}\,{x}}\,\mathrm{d}x = 2 \frac{\cos{\frac{x}{2}} + \sin{\frac{x}{2}}}{\cos{\frac{x}{2}} - \sin{\frac{x}{2}}} \sqrt{\operatorname{cvs}\,{x}} = 2\sqrt{1 + \sin{x}}
kde \mathrm{cvs}\,x = 1 - \sin x.
: \int x\sin cx\;\mathrm{d}x = \frac{\sin cx}{c^2}-\frac{x\cos cx}{c}\,\!
: \int x^n\sin cx\;\mathrm{d}x = -\frac{x^n}{c}\cos cx+\frac{n}{c}\int x^{n-1}\cos cx\;\mathrm{d}x \qquad\mbox{(pro }n>0\mbox{)}\,\!
: \int_{\frac{-a}{2}}^{\frac{a}{2}} x^2\sin^2 {\frac{n\pi x}{a}}\;\mathrm{d}x = \frac{a^3(n^2\pi^2-6)}{24n^2\pi^2} \qquad\mbox{(pro }n=2,4,6...\mbox{)}\,\!
: \int\frac{\sin cx}{x} \mathrm{d}x = \sum_{i=0}^\infty (-1)^i\frac{(cx)^{2i+1}}{(2i+1)\cdot (2i+1)!}\,\!
: \int\frac{\sin cx}{x^n} \mathrm{d}x = -\frac{\sin cx}{(n-1)x^{n-1}} + \frac{c}{n-1}\int\frac{\cos cx}{x^{n-1}} \mathrm{d}x\,\!
: \int\frac{\mathrm{d}x}{\sin cx} = \frac{1}{c}\ln \left|\tan\frac{cx}{2}\right|
: \int\frac{\mathrm{d}x}{\sin^n cx} = \frac{\cos cx}{c(1-n) \sin^{n-1} cx}+\frac{n-2}{n-1}\int\frac{\mathrm{d}x}{\sin^{n-2}cx} \qquad\mbox{(pro }n>1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{1\pm\sin cx} = \frac{1}{c}\tan\left(\frac{cx}{2}\mp\frac{\pi}{4}\right)
: \int\frac{x\;\mathrm{d}x}{1+\sin cx} = \frac{x}{c}\tan\left(\frac{cx}{2} - \frac{\pi}{4}\right)+\frac{2}{c^2}\ln\left|\cos\left(\frac{cx}{2}-\frac{\pi}{4}\right)\right|
: \int\frac{x\;\mathrm{d}x}{1-\sin cx} = \frac{x}{c}\cot\left(\frac{\pi}{4} - \frac{cx}{2}\right)+\frac{2}{c^2}\ln\left|\sin\left(\frac{\pi}{4}-\frac{cx}{2}\right)\right|
: \int\frac{\sin cx\;\mathrm{d}x}{1\pm\sin cx} = \pm x+\frac{1}{c}\tan\left(\frac{\pi}{4}\mp\frac{cx}{2}\right)
: \int\sin c_1x\sin c_2x\;\mathrm{d}x = \frac{\sin(c_1-c_2)x}{2(c_1-c_2)}-\frac{\sin(c_1+c_2)x}{2(c_1+c_2)} \qquad\mbox{(pro }|c_1|\neq|c_2|\mbox{)}\,\!
Integrály obsahující cos
: \int\cos cx\;\mathrm{d}x = \frac{1}{c}\sin cx\,\!
: \int\cos^n cx\;\mathrm{d}x = \frac{\cos^{n-1} cx\sin cx}{nc} + \frac{n-1}{n}\int\cos^{n-2} cx\;\mathrm{d}x \qquad\mbox{(pro }n>0\mbox{)}\,\!
: \int x\cos cx\;\mathrm{d}x = \frac{\cos cx}{c^2} + \frac{x\sin cx}{c}\,\!
: \int x^n\cos cx\;\mathrm{d}x = \frac{x^n\sin cx}{c} - \frac{n}{c}\int x^{n-1}\sin cx\;\mathrm{d}x\,\!
: \int_{\frac{-a}{2}}^{\frac{a}{2}} x^2\cos^2 {\frac{n\pi x}{a}}\;\mathrm{d}x = \frac{a^3(n^2\pi^2-6)}{24n^2\pi^2} \qquad\mbox{(pro }n=1,3,5...\mbox{)}\,\!
: \int\frac{\cos cx}{x} \mathrm{d}x = \ln|cx|+\sum_{i=1}^\infty (-1)^i\frac{(cx)^{2i}}{2i\cdot(2i)!}\,\!
: \int\frac{\cos cx}{x^n} \mathrm{d}x = -\frac{\cos cx}{(n-1)x^{n-1}}-\frac{c}{n-1}\int\frac{\sin cx}{x^{n-1}} \mathrm{d}x \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{\cos cx} = \frac{1}{c}\ln\left|\tan\left(\frac{cx}{2}+\frac{\pi}{4}\right)\right|
: \int\frac{\mathrm{d}x}{\cos^n cx} = \frac{\sin cx}{c(n-1) cos^{n-1} cx} + \frac{n-2}{n-1}\int\frac{\mathrm{d}x}{\cos^{n-2} cx} \qquad\mbox{(pro }n>1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{1+\cos cx} = \frac{1}{c}\tan\frac{cx}{2}\,\!
: \int\frac{\mathrm{d}x}{1-\cos cx} = -\frac{1}{c}\cot\frac{cx}{2}\,\!
: \int\frac{x\;\mathrm{d}x}{1+\cos cx} = \frac{x}{c}\tan\frac{cx}{2} + \frac{2}{c^2}\ln\left|\cos\frac{cx}{2}\right|
: \int\frac{x\;\mathrm{d}x}{1-\cos cx} = -\frac{x}{c}\cot\frac{cx}{2}+\frac{2}{c^2}\ln\left|\sin\frac{cx}{2}\right|
: \int\frac{\cos cx\;\mathrm{d}x}{1+\cos cx} = x - \frac{1}{c}\tan\frac{cx}{2}\,\!
: \int\frac{\cos cx\;\mathrm{d}x}{1-\cos cx} = -x-\frac{1}{c}\cot\frac{cx}{2}\,\!
: \int\cos c_1x\cos c_2x\;\mathrm{d}x = \frac{\sin(c_1-c_2)x}{2(c_1-c_2)}+\frac{\sin(c_1+c_2)x}{2(c_1+c_2)} \qquad\mbox{(pro }|c_1|\neq|c_2|\mbox{)}\,\!
Integrály obsahující tg
: \int\tan cx\;\mathrm{d}x = -\frac{1}{c}\ln|\cos cx|\,\! = \frac{1}{c}\ln|\sec cx|\,\!
: \int\tan^n cx\;\mathrm{d}x = \frac{1}{c(n-1)}\tan^{n-1} cx-\int\tan^{n-2} cx\;\mathrm{d}x \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{\tan cx + 1} = \frac{x}{2} + \frac{1}{2c}\ln|\sin cx + \cos cx|\,\!
: \int\frac{\mathrm{d}x}{\tan cx - 1} = -\frac{x}{2} + \frac{1}{2c}\ln|\sin cx - \cos cx|\,\!
: \int\frac{\tan cx\;\mathrm{d}x}{\tan cx + 1} = \frac{x}{2} - \frac{1}{2c}\ln|\sin cx + \cos cx|\,\!
: \int\frac{\tan cx\;\mathrm{d}x}{\tan cx - 1} = \frac{x}{2} + \frac{1}{2c}\ln|\sin cx - \cos cx|\,\!
Integrály obsahující sec
:\int \sec{cx} \, \mathrm{d}x = \frac{1}{c}\ln{\left| \sec{cx} + \tan{cx}\right|}
:\int \sec^n{cx} \, \mathrm{d}x = \frac{\sec^{n-1}{cx} \sin {cx}}{c(n-1)} \,+\, \frac{n-2}{n-1}\int \sec^{n-2}{cx} \, \mathrm{d}x \qquad \mbox{ (pro }n \ne 1\mbox{)}\,\!
:\int \frac{\mathrm{d}x}{\sec{x} + 1} = x - \tan{\frac{x}{2}}
Integrály obsahující csc
:\int \csc{cx} \, \mathrm{d}x = -\frac{1}{c}\ln{\left| \csc{cx} + \cot{cx}\right|}
:\int \csc^n{cx} \, \mathrm{d}x = -\frac{\csc^{n-1}{cx} \cos{cx}}{c(n-1)} \,+\, \frac{n-2}{n-1}\int \csc^{n-2}{cx} \, \mathrm{d}x \qquad \mbox{ (pro }n \ne 1\mbox{)}\,\!
Integrály obsahující cotg
: \int\cot cx\;\mathrm{d}x = \frac{1}{c}\ln|\sin cx|\,\!
: \int\cot^n cx\;\mathrm{d}x = -\frac{1}{c(n-1)}\cot^{n-1} cx - \int\cot^{n-2} cx\;\mathrm{d}x \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{1 + \cot cx} = \int\frac{\tan cx\;\mathrm{d}x}{\tan cx+1}\,\!
: \int\frac{\mathrm{d}x}{1 - \cot cx} = \int\frac{\tan cx\;\mathrm{d}x}{\tan cx-1}\,\!
Integrály obsahující sin a cos
: \int\frac{\mathrm{d}x}{\cos cx\pm\sin cx} = \frac{1}{c\sqrt{2}}\ln\left|\tan\left(\frac{cx}{2}\pm\frac{\pi}{8}\right)\right|
: \int\frac{\mathrm{d}x}{(\cos cx\pm\sin cx)^2} = \frac{1}{2c}\tan\left(cx\mp\frac{\pi}{4}\right)
: \int\frac{\mathrm{d}x}{(\cos x + \sin x)^n} = \frac{1}{n-1}\left(\frac{\sin x - \cos x}{(\cos x + \sin x)^{n - 1}} - 2(n - 2)\int\frac{\mathrm{d}x}{(\cos x + \sin x)^{n-2}} \right)
: \int\frac{\cos cx\;\mathrm{d}x}{\cos cx + \sin cx} = \frac{x}{2} + \frac{1}{2c}\ln\left|\sin cx + \cos cx\right|
: \int\frac{\cos cx\;\mathrm{d}x}{\cos cx - \sin cx} = \frac{x}{2} - \frac{1}{2c}\ln\left|\sin cx - \cos cx\right|
: \int\frac{\sin cx\;\mathrm{d}x}{\cos cx + \sin cx} = \frac{x}{2} - \frac{1}{2c}\ln\left|\sin cx + \cos cx\right|
: \int\frac{\sin cx\;\mathrm{d}x}{\cos cx - \sin cx} = -\frac{x}{2} - \frac{1}{2c}\ln\left|\sin cx - \cos cx\right|
: \int\frac{\cos cx\;\mathrm{d}x}{\sin cx(1+\cos cx)} = -\frac{1}{4c}\tan^2\frac{cx}{2}+\frac{1}{2c}\ln\left|\tan\frac{cx}{2}\right|
: \int\frac{\cos cx\;\mathrm{d}x}{\sin cx(1+-\cos cx)} = -\frac{1}{4c}\cot^2\frac{cx}{2}-\frac{1}{2c}\ln\left|\tan\frac{cx}{2}\right|
: \int\frac{\sin cx\;\mathrm{d}x}{\cos cx(1+\sin cx)} = \frac{1}{4c}\cot^2\left(\frac{cx}{2}+\frac{\pi}{4}\right)+\frac{1}{2c}\ln\left|\tan\left(\frac{cx}{2}+\frac{\pi}{4}\right)\right|
: \int\frac{\sin cx\;\mathrm{d}x}{\cos cx(1-\sin cx)} = \frac{1}{4c}\tan^2\left(\frac{cx}{2}+\frac{\pi}{4}\right)-\frac{1}{2c}\ln\left|\tan\left(\frac{cx}{2}+\frac{\pi}{4}\right)\right|
: \int\sin cx\cos cx\;\mathrm{d}x = \frac{1}{2c}\sin^2 cx\,\!
: \int\sin c_1x\cos c_2x\;\mathrm{d}x = -\frac{\cos(c_1+c_2)x}{2(c_1+c_2)}-\frac{\cos(c_1-c_2)x}{2(c_1-c_2)} \qquad\mbox{(pro }|c_1|\neq|c_2|\mbox{)}\,\!
: \int\sin^n cx\cos cx\;\mathrm{d}x = \frac{1}{c(n+1)}\sin^{n+1} cx \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\sin cx\cos^n cx\;\mathrm{d}x = -\frac{1}{c(n+1)}\cos^{n+1} cx \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\sin^n cx\cos^m cx\;\mathrm{d}x = -\frac{\sin^{n-1} cx\cos^{m+1} cx}{c(n+m)}+\frac{n-1}{n+m}\int\sin^{n-2} cx\cos^m cx\;\mathrm{d}x \qquad\mbox{(pro }m,n>0\mbox{)}\,\!
: také: \int\sin^n cx\cos^m cx\;\mathrm{d}x = \frac{\sin^{n+1} cx\cos^{m-1} cx}{c(n+m)} + \frac{m-1}{n+m}\int\sin^n cx\cos^{m-2} cx\;\mathrm{d}x \qquad\mbox{(pro }m,n>0\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{\sin cx\cos cx} = \frac{1}{c}\ln\left|\tan cx\right|
: \int\frac{\mathrm{d}x}{\sin cx\cos^n cx} = \frac{1}{c(n-1)\cos^{n-1} cx}+\int\frac{\mathrm{d}x}{\sin cx\cos^{n-2} cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\mathrm{d}x}{\sin^n cx\cos cx} = -\frac{1}{c(n-1)\sin^{n-1} cx}+\int\frac{\mathrm{d}x}{\sin^{n-2} cx\cos cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\sin cx\;\mathrm{d}x}{\cos^n cx} = \frac{1}{c(n-1)\cos^{n-1} cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\sin^2 cx\;\mathrm{d}x}{\cos cx} = -\frac{1}{c}\sin cx+\frac{1}{c}\ln\left|\tan\left(\frac{\pi}{4}+\frac{cx}{2}\right)\right|
: \int\frac{\sin^2 cx\;\mathrm{d}x}{\cos^n cx} = \frac{\sin cx}{c(n-1)\cos^{n-1}cx}-\frac{1}{n-1}\int\frac{\mathrm{d}x}{\cos^{n-2}cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\sin^n cx\;\mathrm{d}x}{\cos cx} = -\frac{\sin^{n-1} cx}{c(n-1)} + \int\frac{\sin^{n-2} cx\;\mathrm{d}x}{\cos cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\sin^n cx\;\mathrm{d}x}{\cos^m cx} = \frac{\sin^{n+1} cx}{c(m-1)\cos^{m-1} cx}-\frac{n-m+2}{m-1}\int\frac{\sin^n cx\;\mathrm{d}x}{\cos^{m-2} cx} \qquad\mbox{(pro }m\neq 1\mbox{)}\,\!
: také: \int\frac{\sin^n cx\;\mathrm{d}x}{\cos^m cx} = -\frac{\sin^{n-1} cx}{c(n-m)\cos^{m-1} cx}+\frac{n-1}{n-m}\int\frac{\sin^{n-2} cx\;\mathrm{d}x}{\cos^m cx} \qquad\mbox{(pro }m\neq n\mbox{)}\,\!
: také: \int\frac{\sin^n cx\;\mathrm{d}x}{\cos^m cx} = \frac{\sin^{n-1} cx}{c(m-1)\cos^{m-1} cx}-\frac{n-1}{n-1}\int\frac{\sin^{n-1} cx\;\mathrm{d}x}{\cos^{m-2} cx} \qquad\mbox{(pro }m\neq 1\mbox{)}\,\!
: \int\frac{\cos cx\;\mathrm{d}x}{\sin^n cx} = -\frac{1}{c(n-1)\sin^{n-1} cx} \qquad\mbox{(pro }n\neq 1\mbox{)}\,\!
: \int\frac{\cos^2 cx\;\mathrm{d}x}{\sin cx} = \frac{1}{c}\left(\cos cx+\ln\left|\tan\frac{cx}{2}\right|\right)
: \int\frac{\cos^2 cx\;\mathrm{d}x}{\sin^n cx} = -\frac{1}{n-1}\left(\frac{\cos cx}{c\sin^{n-1} cx)}+\int\frac{\mathrm{d}x}{\sin^{n-2} cx}\right) \qquad\mbox{(pro }n\neq 1\mbox{)}
: \int\frac{\cos^n cx\;\mathrm{d}x}{\sin^m cx} = -\frac{\cos^{n+1} cx}{c(m-1)\sin^{m-1} cx} - \frac{n-m-2}{m-1}\int\frac{cos^n cx\;\mathrm{d}x}{\sin^{m-2} cx} \qquad\mbox{(pro }m\neq 1\mbox{)}\,\!
: také: \int\frac{\cos^n cx\;\mathrm{d}x}{\sin^m cx} = \frac{\cos^{n-1} cx}{c(n-m)\sin^{m-1} cx} + \frac{n-1}{n-m}\int\frac{cos^{n-2} cx\;\mathrm{d}x}{\sin^m cx} \qquad\mbox{(pro }m\neq n\mbox{)}\,\!
: také: \int\frac{\cos^n cx\;\mathrm{d}x}{\sin^m cx} = -\frac{\cos^{n-1} cx}{c(m-1)\sin^{m-1} cx} - \frac{n-1}{m-1}\int\frac{cos^{n-2} cx\;\mathrm{d}x}{\sin^{m-2} cx} \qquad\mbox{(pro }m\neq 1\mbox{)}\,\!