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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 2021-5-3
Ran in:

2 个投票

Ran in:
Perhaps try using the Steps name-value pair.
syms x
simplify(1-cos(x)^2,'Steps',10)
ans = 

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Tunahan Keskin
Tunahan Keskin 2021-5-3
I didn't know this existed, thank you.
Tunahan Keskin
Tunahan Keskin 2021-5-3
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 2021-5-3
That is correct. It will not always simplify to what you want.

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