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# Primitives Functions

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Tool to find primitives of functions. Integration of a function is the calculation of all its primitives, the inverse of the derivative.
Summary

## Primitive Function Calculator

### How to calculate a primitive/integral?

The primitive of a function $f$ defined over an interval $I$ is a function $F$ (usually noted in uppercase), defined and differentiable over $I$, which derivative is $f$, ie. $F'(x) = f(x)$.

Example: If $f(x) = x^2+sin(x)$ then the primitive is $F(x) = \frac{1}{3}x^3-cos(x) + C$ (with $C$ a constant).

dCode knows all functions and their primitives. Enter the function and its variable to integrate and dCode do the computation of the primitive function.

Mathematicians use primitive/integration to find the function calculating the area under the curve.

### What is the list of common primitives?

FunctionPrimitive
$$\int \,\rm dx$$$$x + C$$
$$\int x^n\,\rm dx$$$$\frac{x^{n+1}}{n+1} + C \qquad n \ne -1$$
$$\int \frac{1}{x}\,\rm dx$$$$\ln \left| x \right| + C \qquad x \ne 0$$
$$\int \frac{1}{x-a} \, \rm dx$$$$\ln | x-a | + C \qquad x \ne a$$
$$\int \frac{1}{(x-a)^n} \, \rm dx$$$$-\frac{1}{(n-1)(x-a)^{n-1}} + C \qquad n \ne 1 , x \ne a$$
$$\int \frac{1}{1+x^2} \, \rm dx$$$$\operatorname{arctan}(x) + C$$
$$\int \frac{1}{a^2+x^2} \, \rm dx$$$$\frac{1}{a}\operatorname{arctan}{ \left( \frac{x}{a} \right) } + C \qquad a \ne 0$$
$$\int \frac{1}{1-x^2} \, \rm dx$$$$\frac{1}{2} \ln { \left| \frac{x+1}{x-1} \right| } + C$$
$$\int \ln (x)\,\rm dx$$$$x \ln (x) - x + C$$
$$\int \log_b (x)\,\rm dx$$$$x \log_b (x) - x \log_b (e) + C$$
$$\int e^x\,\rm dx$$$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$$The primitive calculation of some functions within dCode calculator can involve the functions denoted$ F $and$ E $respectively first and second kind of elliptic integrals, or$ Li_2 the Spence's function.

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Tag(s) : Functions, Symbolic Computation
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