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Integral of (cos²(2x)-sin²(2x)) dx

Limits of integration:

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The graph:

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Piecewise:

The solution

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 pi                           
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 |  \cos (2*x) - sin (2*x)/ dx
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$$\int\limits_{0}^{\frac{\pi}{8}} \left(- \sin^{2}{\left(2 x \right)} + \cos^{2}{\left(2 x \right)}\right)\, dx$$
Integral(cos(2*x)^2 - sin(2*x)^2, (x, 0, pi/8))
Detail solution
  1. Integrate term-by-term:

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

      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:

      So, the result is:

    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. 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:

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

      The result is:

    The result is:

  2. Add the constant of integration:


The answer is:

The graph
The answer [src]
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$$\frac{1}{4}$$
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$$\frac{1}{4}$$
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    Use the examples entering the upper and lower limits of integration.