1-cos(x)^2 doesn't simplify?

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Tunahan Keskin
Tunahan Keskin le 3 Mai 2021
Commenté : Cris LaPierre le 3 Mai 2021
I found an ancient similar question, apperantly it used to work when at least x is not assigned. But when I try
syms x
simplify (1-cos(x)^2)
I get ans = 1 - cos(x)^2
Is there a reason for this, or is it just a bug?

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Cris LaPierre
Cris LaPierre le 3 Mai 2021
Perhaps try using the Steps name-value pair.
syms x
simplify(1-cos(x)^2,'Steps',10)
ans = 
  3 commentaires
Tunahan Keskin
Tunahan Keskin le 3 Mai 2021
This seems to not always work.
syms z phi
simplify(2*z^2*cos(phi) + 1 - cos(phi)^2 ,'steps',100)
ans = 2*z^2*cos(phi) - cos(phi)^2 + 1
Cris LaPierre
Cris LaPierre le 3 Mai 2021
That is correct. It will not always simplify to what you want.

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