mathematical physics – How to seperate the real part and imaginary part from a complex expression

I need to saperate the real part and the imaginary part from the following expression.

``````     Csc(2 (Theta)12)^3 (-32 E^(4 I (Delta))
Cos((Theta)23)^3 Cos(
2 (Theta)23) (Cos((Delta)) Cos((Theta)13)^2 +
I Sin((Delta))) Sin(
2 (Theta)12) (E^(I (Delta))
Cos((Theta)23) Sin(2 (Theta)12)^2 +
2 Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23))
(PlusMinus)
I E^(2 I (Delta))
Cos((Theta)23) (Cos((Theta)23) Sin(2 (Theta)12)^2 +
E^(-I (Delta))
Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23)) ((1 -
3 E^(2 I (Delta))) Cos(2 (Theta)23) +
32 E^(3 I (Delta))
Cos((Theta)23)^3 (E^(I (Delta))
Cos((Theta)23) Sin(2 (Theta)12)^2 +
2 Sin(4 (Theta)12) Sin((Theta)13) Sin((Theta)23)) + (1
+ E^(2 I (Delta))) (-1 +
2 Cos(2 (Theta)23) Sin((Theta)23)^2)))
Sec((Theta)23)^6)/(64 (E^(I (Delta)) Sin((Theta)12) +
Cos((Theta)12) Sin((Theta)13) Tan((Theta)23))^2 (E^(
I (Delta)) +
4 Cot(2 (Theta)12) Sin((Theta)13) Tan((Theta)23)));```
On doing ```ComplexExpand(Expr1)$$``$$ I am not getting the correct expression. Please help me out.
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