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Solving integrals/ cos(11x)cos(9x)

Integral of cos(11x)cos(9x) dx

Limits of integration:

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The graph:

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Piecewise:

The solution

You have entered [src] 
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 |  cos(11*x)*cos(9*x) dx
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$$\int\limits_{0}^{1} \cos{\left(9 x \right)} \cos{\left(11 x \right)}\, dx$$ 
Integral(cos(11*x)*cos(9*x), (x, 0, 1))
The graph
Plot the graph f(x)
The answer [src] 
  9*cos(11)*sin(9)   11*cos(9)*sin(11)
- ---------------- + -----------------
         40                  40
$$- \frac{9 \sin{\left(9 \right)} \cos{\left(11 \right)}}{40} + \frac{11 \sin{\left(11 \right)} \cos{\left(9 \right)}}{40}$$ 
=
= 
  9*cos(11)*sin(9)   11*cos(9)*sin(11)
- ---------------- + -----------------
         40                  40
$$- \frac{9 \sin{\left(9 \right)} \cos{\left(11 \right)}}{40} + \frac{11 \sin{\left(11 \right)} \cos{\left(9 \right)}}{40}$$ 
-9*cos(11)*sin(9)/40 + 11*cos(9)*sin(11)/40
Numerical answer [src] 
0.250147987974611
0.250147987974611

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

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