Question: Unable to integrate

I am unable to integrate this equation

restart:
with(DETools):
with(IntegrationTools):
u[1](r,z):=(C[o]^2*exp(2*lambda*z)-D[o]^2*exp(-2*lambda*z))+(lambda/2)*(C[o]*exp(lambda*z)-D[o]*exp(-lambda*z))*(1-r^4)+A[1](z)*r^2:
M1:=int(u[1](r,z), z):
 

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