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x*sin²(x)

Integral of x*sin²(x) dx

Limits of integration:

from to
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The graph:

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Piecewise:

The solution

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  1             
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 |       2      
 |  x*sin (x) dx
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$$\int\limits_{0}^{1} x \sin^{2}{\left(x \right)}\, dx$$
Integral(x*sin(x)^2, (x, 0, 1))
Detail solution
  1. Use integration by parts:

    Let and let .

    Then .

    To find :

    1. Rewrite the integrand:

    2. Integrate term-by-term:

      1. The integral of a constant is the constant times the variable of integration:

      1. The integral of a constant times a function is the constant times the integral of the function:

        1. Let .

          Then let and substitute :

          1. The integral of a constant times a function is the constant times the integral of the function:

            1. The integral of cosine is sine:

            So, the result is:

          Now substitute back in:

        So, the result is:

      The result is:

    Now evaluate the sub-integral.

  2. Integrate term-by-term:

    1. The integral of a constant times a function is the constant times the integral of the function:

      1. The integral of is when :

      So, the result is:

    1. The integral of a constant times a function is the constant times the integral of the function:

      1. There are multiple ways to do this integral.

        Method #1

        1. Let .

          Then let and substitute :

          1. The integral of a constant times a function is the constant times the integral of the function:

            1. The integral of sine is negative cosine:

            So, the result is:

          Now substitute back in:

        Method #2

        1. The integral of a constant times a function is the constant times the integral of the function:

          1. There are multiple ways to do this integral.

            Method #1

            1. Let .

              Then let and substitute :

              1. The integral of a constant times a function is the constant times the integral of the function:

                1. The integral of is when :

                So, the result is:

              Now substitute back in:

            Method #2

            1. Let .

              Then let and substitute :

              1. The integral of is when :

              Now substitute back in:

          So, the result is:

      So, the result is:

    The result is:

  3. Now simplify:

  4. Add the constant of integration:


The answer is:

The answer (Indefinite) [src]
  /                                                   
 |                     2                              
 |      2             x    cos(2*x)     /x   sin(2*x)\
 | x*sin (x) dx = C - -- - -------- + x*|- - --------|
 |                    4       8         \2      4    /
/                                                     
$$-{{2\,x\,\sin \left(2\,x\right)+\cos \left(2\,x\right)-2\,x^2 }\over{8}}$$
The graph
The answer [src]
   2         2                   
sin (1)   cos (1)   cos(1)*sin(1)
------- + ------- - -------------
   2         4            2      
$${{1}\over{8}}-{{2\,\sin 2+\cos 2-2}\over{8}}$$
=
=
   2         2                   
sin (1)   cos (1)   cos(1)*sin(1)
------- + ------- - -------------
   2         4            2      
$$- \frac{\sin{\left(1 \right)} \cos{\left(1 \right)}}{2} + \frac{\cos^{2}{\left(1 \right)}}{4} + \frac{\sin^{2}{\left(1 \right)}}{2}$$
Numerical answer [src]
0.199693997861972
0.199693997861972
The graph
Integral of x*sin²(x) dx

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