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Suppose we have two expressions and == between them. I want to simplify only the right-hand side. What should I do?

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  • $\begingroup$ Also, #[[1]] == Simplify[#[[2]]] &@equation or ReplacePart[equation, 2 -> Simplify[equation[[2]]]] $\endgroup$
    – Bob Hanlon
    Commented Nov 26, 2021 at 12:39
  • $\begingroup$ Alternative: Simplify[equation[[2] ] $\endgroup$
    – Ulrich Neumann
    Commented Nov 26, 2021 at 12:39
  • $\begingroup$ @UlrichNeumann did not you forget a brace? $\endgroup$
    – Anixx
    Commented Nov 26, 2021 at 14:31
  • $\begingroup$ @Anixx: Yes, Simplify[equation[[2]] ] $\endgroup$
    – Ulrich Neumann
    Commented Nov 26, 2021 at 14:46

1 Answer 1

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$\begingroup$ 
equation = y + z  == D[Integrate[1/(x^3 + 1), x], x]

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You can use MapAt:

MapAt[Simplify, equation, {2}]

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