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(I Gr0 theta Sqrt[1 - theta^2]) / 
  (2 Gr0Mz (-1 + theta^2) (1 - 2 coff1 theta trMz wn + coff1^2 trMz^2 wn^2))

Replace the denominator of the expression with T1，How can I achieve？I tried： enter image description here

but failed.

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    $\begingroup$ why note just Numerator[expr]/ T1 or Simplify[expr, {Denominator[expr] == T1}]? $\endgroup$
    – kglr
    Jul 1, 2018 at 8:54
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    $\begingroup$ When a replacement is failing, the way to understand why is to look at the FullForm of the expression. That's what you have to match. $\endgroup$
    – John Doty
    Jul 1, 2018 at 12:22

1 Answer 1

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$\begingroup$ 
expr = (I Gr0 theta Sqrt[1 - theta^2]) / 
  (2 Gr0Mz (-1 + theta^2) (1 - 2 coff1 theta trMz wn + coff1^2 trMz^2 wn^2));

Numerator[expr] / T1 (* or *)
Simplify[expr, {Denominator[expr] == T1}]

 (I Gr0 theta Sqrt[1 - theta^2]) / T1
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