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it's an indefinite integral, since "a" is arbitrary
Carlo Beenakker
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Indefinite integration of multiplication of two Bessel function

I am trying to calculate this integral. I know it has an analytic expression when $a = 0$. But, is there any analytic expression for this case?

$$\int_{a}^{\infty}J_2(bx)J_1(cx)\,dx$$

Thanks in advance.

bordart
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