Integral of $$$\sin{\left(2 x \right)} \sin{\left(6 x \right)} \cos{\left(2 x \right)} \cos{\left(6 x \right)}$$$
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Find $$$\int \sin{\left(2 x \right)} \sin{\left(6 x \right)} \cos{\left(2 x \right)} \cos{\left(6 x \right)}\, dx$$$.