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Let int(2x^(6)+15x^(4)+2x^(2)+3)cos2xdx=...

Let `int(2x^(6)+15x^(4)+2x^(2)+3)cos2xdx=f(x)sin(2x)+g(x)cos(2x)+K`, Where `f(x)` and `g(x)` are polynomial functions of `x` and `K ` is the constant of integration. `qquad int(g(x)/f(x))(dx)`

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