# Tabular Integration Calculator

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### Difficult Problems

1

Solved example of tabular integration

$\int x^4sin\left(x\right)dx$
2

We can solve the integral $\int x^4\sin\left(x\right)dx$ by applying the method of tabular integration by parts, which allows us to perform successive integrations by parts on integrals of the form $\int P(x)T(x) dx$. $P(x)$ is typically a polynomial function and $T(x)$ is a transcendent function such as $\sin(x)$, $\cos(x)$ and $e^x$. The first step is to choose functions $P(x)$ and $T(x)$

$\begin{matrix}P(x)=x^4 \\ T(x)=\sin\left(x\right)\end{matrix}$

Find the derivative of $x^4$ with respect to $x$

$x^4$

The power rule for differentiation states that if $n$ is a real number and $f(x) = x^n$, then $f'(x) = nx^{n-1}$

$4x^{\left(4-1\right)}$

Subtract the values $4$ and $-1$

$4x^{3}$

The derivative of a function multiplied by a constant ($4$) is equal to the constant times the derivative of the function

$4\frac{d}{dx}\left(x^{3}\right)$

The power rule for differentiation states that if $n$ is a real number and $f(x) = x^n$, then $f'(x) = nx^{n-1}$

$12x^{2}$

The derivative of a function multiplied by a constant ($12$) is equal to the constant times the derivative of the function

$12\frac{d}{dx}\left(x^{2}\right)$

The power rule for differentiation states that if $n$ is a real number and $f(x) = x^n$, then $f'(x) = nx^{n-1}$

$24x$

The derivative of the linear function times a constant, is equal to the constant

$24$

The derivative of the constant function ($24$) is equal to zero

0
3

Derive $P(x)$ until it becomes $0$

$0$

Find the integral of $\sin\left(x\right)$ with respect to $x$

$\sin\left(x\right)$

Apply the integral of the sine function: $\int\sin(x)dx=-\cos(x)$

$-\cos\left(x\right)$

The integral of a constant by a function is equal to the constant multiplied by the integral of the function

$-\int\cos\left(x\right)dx$

Apply the integral of the cosine function: $\int\cos(x)dx=\sin(x)$

$-\sin\left(x\right)$

The integral of a constant by a function is equal to the constant multiplied by the integral of the function

$-\int\sin\left(x\right)dx$

Apply the integral of the sine function: $\int\sin(x)dx=-\cos(x)$

$\cos\left(x\right)$

Apply the integral of the cosine function: $\int\cos(x)dx=\sin(x)$

$\sin\left(x\right)$

Apply the integral of the sine function: $\int\sin(x)dx=-\cos(x)$

$-\cos\left(x\right)$
4

Integrate $T(x)$ as many times as we have had to derive $P(x)$

$-\cos\left(x\right)$
5

With the derivatives and integrals of both functions we build the following table

$\begin{matrix}\mathrm{Derivatives} & \mathrm{Sign} & \mathrm{Integrals} \\ & & \sin\left(x\right) \\ x^4 & + & -\cos\left(x\right) \\ 4x^{3} & - & -\sin\left(x\right) \\ 12x^{2} & + & \cos\left(x\right) \\ 24x & - & \sin\left(x\right) \\ 24 & + & -\cos\left(x\right) \\ 0 & & \end{matrix}$
6

Then the solution is the sum of the products of the derivatives and the integrals according to the previous table. The first term consists of the product of the polynomial function by the first integral. The second term is the product of the first derivative by the second integral, and so on.

$-x^4\cos\left(x\right)+4x^{3}\sin\left(x\right)+12x^{2}\cos\left(x\right)-24x\sin\left(x\right)-24\cos\left(x\right)$
7

As the integral that we are solving is an indefinite integral, when we finish integrating we must add the constant of integration $C$

$-x^4\cos\left(x\right)+4x^{3}\sin\left(x\right)+12x^{2}\cos\left(x\right)-24x\sin\left(x\right)-24\cos\left(x\right)+C_0$

$-x^4\cos\left(x\right)+4x^{3}\sin\left(x\right)+12x^{2}\cos\left(x\right)-24x\sin\left(x\right)-24\cos\left(x\right)+C_0$

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