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I'm trying to simplify an expression or equation symbolically and I get the same error every time. Undefined function or variable 'x'.

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I'm trying to simplify an expression symbolically and I get the same error every time.
Undefined function or variable 'x'.
I'm even using the actual example matlab provides. Trying to just simplify the expression sin(x)^2 + cos(x)^2 I get the error everytime. I'm brand new...what am I missing.

Accepted Answer

Meghana Dinesh
Meghana Dinesh on 6 Feb 2016
Edited: Meghana Dinesh on 6 Feb 2016
What exactly is your command? It seems like you haven't told MATLAB what the value of x is. First, initialize a value for x and the carry on.
x = 0.5;
sin(x)^2 + cos(x)^2;
  4 Comments
MichaelTee
MichaelTee on 6 Feb 2016
I tried your code and it gives me a specific answer. I want to simplify an expression. Not get a specific answer.

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More Answers (1)

Bala Abhirami
Bala Abhirami on 25 May 2021
Edited: Bala Abhirami on 25 May 2021
The function u[1]/(u[2]^0.5) shows the error "result of the function is undefined" in matlab simulink user defined function. What could be the reason?

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