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Why does Mathematica not simplify the following expression?

assumptions = {a \[Element] Reals, b \[Element] Reals, c \[Element] Reals}
FullSimplify[Conjugate[I a b + c (I b + c)], Assumptions -> assumptions]
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    $\begingroup$ Try ComplexExpand[Conjugate[I a b + c (I b + c)]] $\endgroup$
    – gpap
    Commented Nov 30, 2017 at 12:51
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    $\begingroup$ assumptions = {(a | b | c) \[Element] Reals}; Simplify[Conjugate[I a b + c (I b + c)] // ComplexExpand, assumptions] $\endgroup$
    – Bob Hanlon
    Commented Nov 30, 2017 at 14:03
  • $\begingroup$ Thanks, ComplexExpand does the job. $\endgroup$
    – physicsGuy
    Commented Nov 30, 2017 at 16:50

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