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I'm looking to calculate the amplitude of a transfer function which is defined in a symbolic way :

T=(1 + 2 I r λ)/(1 - r^2 + 2 I r λ)

I try this, i doesn't work

Assuming[{λ > 0, r > 0}, Simplify[Abs[TAdimen]]] r λ)

Do you have ideas so as to calculate the amplitude of a transfer function in a symbolic manner?

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    $\begingroup$ You might be interested in ComplexExpand[]. $\endgroup$ Aug 25, 2017 at 14:26

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