Tool to calculate the integral of a function. The computation of an definite integral over an interval consist in measuring the area under the curve of the function to integrate.

Definite Integral - dCode

Tag(s) : Mathematics

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This page deals with integral calculation on an interval. For the general case, see the calculation of primitives.

Tool to calculate the integral of a function. The computation of an definite integral over an interval consist in measuring the area under the curve of the function to integrate.

To perform an integral calculation, first, calculate the corresponding primitive function.

Consider a function \( f(x) \) to be integrated over \( [a;b] \) and \( F(x) \) the primitive of \( f(x) \). Then $$ \int^b_a f(x) \mathrm{ dx} = F(b)-F(a) $$

Example: Integrate \( f(x) = x \) over the interval \( [0;1] \). Calculate its primitive \( F(x) = \frac{1}{2} x^2 \) and so integral $$ \int^1_0 f(x) \mathrm {dx} = F(1) - F(0) = \frac{1}{2} $$

Enter the function, its lower and upper bounds and the variable to integrate, dCode will make the computation.

Function | Primitive |
---|---|

$$ \int \,\rm dx$$ | $$x + C$$ |

$$ \int x^n\,\rm dx$$ | $$ \frac{x^{n+1}}{n+1} + C \qquad n \ne -1 $$ |

$$ \int \frac{1}{x}\,\rm dx$$ | $$\ln \left| x \right| + C \qquad x \ne 0 $$ |

$$ \int \frac{1}{x-a} \, \rm dx $$ | $$\ln | x-a | + C \qquad x \ne a $$ |

$$ \int \frac{1}{(x-a)^n} \, \rm dx$$ | $$-\frac{1}{(n-1)(x-a)^{n-1}} + C \qquad n \ne 1 , x \ne a $$ |

$$ \int \frac{1}{1+x^2} \, \rm dx$$ | $$\operatorname{arctan}(x) + C $$ |

$$ \int \frac{1}{a^2+x^2} \, \rm dx$$ | $$\frac{1}{a}\operatorname{arctan}{ \left( \frac{x}{a} \right) } + C \qquad a \ne 0 $$ |

$$ \int \frac{1}{1-x^2} \, \rm dx$$ | $$\frac{1}{2} \ln { \left| \frac{x+1}{x-1} \right| } + C $$ |

$$ \int \ln (x)\,\rm dx$$ | $$x \ln (x) - x + C $$ |

$$ \int \log_b (x)\,\rm dx$$ | $$x \log_b (x) - x \log_b (e) + C $$ |

$$ \int e^x\,\rm dx$$ | $$e^x + C $$ |

$$ \int a^x\,\rm dx$$ | $$\frac{a^x}{\ln (a)} + C \qquad a > 0 , a \ne 1 $$ |

$$ \int {1 \over \sqrt{1-x^2}} \, \rm dx$$ | $$\operatorname{arcsin} (x) + C $$ |

$$ \int {-1 \over \sqrt{1-x^2}} \, \rm dx$$ | $$\operatorname{arccos} (x) + C $$ |

$$ \int {x \over \sqrt{x^2-1}} \, \rm dx$$ | $$\sqrt{x^2-1} + C $$ |

$$ \int \sin(x)\,\rm dx $$ | $$ -\cos(x)+C $$ |

$$ \int \cos(x)\,\rm dx $$ | $$ \sin(x)+C $$ |

$$ \int \tan(x)\,\rm dx $$ | $$ -\ln|\cos(x)|+C $$ |

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integral,function,integration,integrate,calculus,derivative,antiderivative,primitive

Source : http://www.dcode.fr/definite-integral

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