Question: Maple cannot solve this integral

Hello,

 

I am new to Maple. I am trying to solve a big integral, but I cannot solve it using Maple.

 

The problem boils down to this integral:

int(exp(x*cos(theta)+y*sin(theta)), theta=0..2*Pi)

 

The solution of this integral is:

2*Pi*BesselI(0, sqrt(x*x+y*y))

 

How can I get Maple to solve these integrals?

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