Why does matlab change cos / sin input?

1 view (last 30 days)
Hello,
Something very weird happens when i try to integrate cos / sin functions. Matlab changes te values i put in the cos / sin for example this happens when i want to integrate acceleration (a) to speed (v):
>> syms x
>> a=cos(-2*x+3)
a =
cos(2*x - 3)
How can i avoid this?
  2 Comments
Stephen23
Stephen23 on 17 Feb 2020
"Something very weird happens when i try to integrate cos / sin functions..."
Why is it weird? They are exactly equivalent.

Sign in to comment.

Answers (1)

Siriniharika Katukam
Siriniharika Katukam on 20 Feb 2020
Hi
Assuming that your issue is the change of signs in the "cos" function, the interpreted value of a as cos(2*x - 3) is right as "cos(x) = cox(-x)". You will get the same values when you try to integrate both cos(-2*x + 3) and cos(2*x – 3).

Tags

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by