Question: Get the real and imaginary part of a complex expression

Hi, I am new in maple, and I would like to get out the real and imaginary part of an expression. My function is as followed: eps*(f)=epsinf+Deltaeps/(1+(i*2*Pi*tau*f)^(1-alpha))^beta where eps* is my complex function with parameters: epsinf, Deltaeps, tau, alpha and beta. f is my variable. This function is known as havriliak Negami function in Physics, which describe the behavior of the dielectric susceptibility for a relaxation. In litteratur, I can find the real and imaginary part of this function, but first I would like to verify it... How is it possible to get the real and imaginary part of this function? Thank you... Best Regards, Ravi
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