Integral of $$$\frac{\cos{\left(x \right)}}{\left(x^{2} + 1\right) \left(x^{2} + 4\right)}$$$
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Find $$$\int \frac{\cos{\left(x \right)}}{\left(x^{2} + 1\right) \left(x^{2} + 4\right)}\, dx$$$.
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