Can someone kindly explain what is wrong with the following? 

I am integrating the function ztanh(pi z)log(z^2+a^2) on a small circle of 
radius x about the point i(n+1/2) 

assume(a>0)
assume(x>=0)
assume(n,'integer')
assume(n+1/2+x < a )
assume(n+1/2 - x > -a) 
z = i*(n+1/2)+x*exp(i*p) 
f = z*tanh(pi*z)*log(z^2+a^2)
f.integrate(p,-pi,pi)



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