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Integral of x*(6-x)*sin(x/6) dx

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The solution

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  6                    
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 |               /x\   
 |  x*(6 - x)*sin|-| dx
 |               \6/   
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$$\int\limits_{0}^{6} x \left(6 - x\right) \sin{\left(\frac{x}{6} \right)}\, dx$$
Integral((x*(6 - x))*sin(x/6), (x, 0, 6))
Detail solution
  1. There are multiple ways to do this integral.

    Method #1

    1. Let .

      Then let and substitute :

      1. Integrate term-by-term:

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

          1. Use integration by parts:

            Let and let .

            Then .

            To find :

            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:

            Now evaluate the sub-integral.

          2. Use integration by parts:

            Let and let .

            Then .

            To find :

            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:

            Now evaluate the sub-integral.

          3. 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 sine is negative cosine:

                So, the result is:

              Now substitute back in:

            So, the result is:

          So, the result is:

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

          1. Use integration by parts:

            Let and let .

            Then .

            To find :

            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:

            Now evaluate the sub-integral.

          2. 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:

          So, the result is:

        The result is:

      Now substitute back in:

    Method #2

    1. Rewrite the integrand:

    2. Integrate term-by-term:

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

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        2. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        3. 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 sine is negative cosine:

              So, the result is:

            Now substitute back in:

          So, the result is:

        So, the result is:

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

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        2. 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:

        So, the result is:

      The result is:

    Method #3

    1. Use integration by parts:

      Let and let .

      Then .

      To find :

      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:

      Now evaluate the sub-integral.

    2. Use integration by parts:

      Let and let .

      Then .

      To find :

      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:

      Now evaluate the sub-integral.

    3. 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 sine is negative cosine:

          So, the result is:

        Now substitute back in:

      So, the result is:

    Method #4

    1. Rewrite the integrand:

    2. Integrate term-by-term:

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

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        2. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        3. 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 sine is negative cosine:

              So, the result is:

            Now substitute back in:

          So, the result is:

        So, the result is:

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

        1. Use integration by parts:

          Let and let .

          Then .

          To find :

          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:

          Now evaluate the sub-integral.

        2. 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:

        So, the result is:

      The result is:

  2. Add the constant of integration:


The answer is:

The answer (Indefinite) [src]
  /                                                                                           
 |                                                                                            
 |              /x\                 /x\          /x\           /x\           /x\      2    /x\
 | x*(6 - x)*sin|-| dx = C - 432*cos|-| + 216*sin|-| - 72*x*sin|-| - 36*x*cos|-| + 6*x *cos|-|
 |              \6/                 \6/          \6/           \6/           \6/           \6/
 |                                                                                            
/                                                                                             
$$\int x \left(6 - x\right) \sin{\left(\frac{x}{6} \right)}\, dx = C + 6 x^{2} \cos{\left(\frac{x}{6} \right)} - 72 x \sin{\left(\frac{x}{6} \right)} - 36 x \cos{\left(\frac{x}{6} \right)} + 216 \sin{\left(\frac{x}{6} \right)} - 432 \cos{\left(\frac{x}{6} \right)}$$
The graph
The answer [src]
432 - 432*cos(1) - 216*sin(1)
$$- 432 \cos{\left(1 \right)} - 216 \sin{\left(1 \right)} + 432$$
=
=
432 - 432*cos(1) - 216*sin(1)
$$- 432 \cos{\left(1 \right)} - 216 \sin{\left(1 \right)} + 432$$
432 - 432*cos(1) - 216*sin(1)
Numerical answer [src]
16.831671146458
16.831671146458

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