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Solving integrals/ x^2cos(x)dx

Integral of x^2cos(x)dx dx

The solution

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$$\int\limits_{0}^{1} x^{2} \cos{\left(x \right)} 1\, dx$$

Integral(x^2*cos(x)*1, (x, 0, 1))

Detail solution

Use integration by parts:

$\int \operatorname{u} \operatorname{dv} = \operatorname{u}\operatorname{v} - \int \operatorname{v} \operatorname{du}$

Let $u{\left(x \right)} = x^{2}$ and let $\operatorname{dv}{\left(x \right)} = \cos{\left(x \right)}$ .

Then $\operatorname{du}{\left(x \right)} = 2 x$ .

To find $v{\left(x \right)}$ :
1. The integral of cosine is sine:
  
  $\int \cos{\left(x \right)}\, dx = \sin{\left(x \right)}$
Now evaluate the sub-integral.
Use integration by parts:

$\int \operatorname{u} \operatorname{dv} = \operatorname{u}\operatorname{v} - \int \operatorname{v} \operatorname{du}$

Let $u{\left(x \right)} = 2 x$ and let $\operatorname{dv}{\left(x \right)} = \sin{\left(x \right)}$ .

Then $\operatorname{du}{\left(x \right)} = 2$ .

To find $v{\left(x \right)}$ :
1. The integral of sine is negative cosine:
  
  $\int \sin{\left(x \right)}\, dx = - \cos{\left(x \right)}$
Now evaluate the sub-integral.
The integral of a constant times a function is the constant times the integral of the function:

$\int \left(- 2 \cos{\left(x \right)}\right)\, dx = - 2 \int \cos{\left(x \right)}\, dx$
1. The integral of cosine is sine:
  
  $\int \cos{\left(x \right)}\, dx = \sin{\left(x \right)}$
So, the result is: $- 2 \sin{\left(x \right)}$
Add the constant of integration:

$x^{2} \sin{\left(x \right)} + 2 x \cos{\left(x \right)} - 2 \sin{\left(x \right)}+ \mathrm{constant}$

The answer is:

$x^{2} \sin{\left(x \right)} + 2 x \cos{\left(x \right)} - 2 \sin{\left(x \right)}+ \mathrm{constant}$

The answer (Indefinite) [src]

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 | x *cos(x)*1 dx = C - 2*sin(x) + x *sin(x) + 2*x*cos(x)
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$$\left(x^2-2\right)\,\sin x+2\,x\,\cos x$$

Simplify

The graph

Plot the graph f(x)

The answer [src]

-sin(1) + 2*cos(1)

$$2\,\cos 1-\sin 1$$

-sin(1) + 2*cos(1)

$$- \sin{\left(1 \right)} + 2 \cos{\left(1 \right)}$$

Упростить

Numerical answer [src]

0.239133626928383

0.239133626928383

The graph

Use the examples entering the upper and lower limits of integration.

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Identical expressions

Similar expressions

Integral of x^2cos(x)dx dx

Limits of integration:

The graph:

Piecewise:

The solution