Question: To find real zeros of a complex function


I`m a new Maple-user and I have some troubles with finding real zeros of a complex function/equation. Suppose that I have let me say CylinderD(n,a)*CylinderD(n,I*a)+exp(I*n*Pi/2)=0 , where a =2.0 and I=sqrt(-1)  and I want to find out the real zeros for this equation. I can count the zeros by using Rouche theorem and argument principle but I need more. Also, I tried to find the roots of a function CylinderD(n,I*a) by using maple and I couldn`t obtain it. Do you have an idea ? Thank you for your help.

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