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Problem, when trying to differentate sin(f(x)), with variable x

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Andy
Andy on 26 Apr 2014
Commented: Azzi Abdelmalek on 27 Apr 2014
Hello!
I would like to try some basic functions in Matlab. I faced two problems, which seems unable to solve for me.
If I type:
a=sin(3*x)
b=diff(a,x)
Then I run it:
a=sin(3*x)(3*x)
b=3*D(sin(3*x))(3*x)
I think it should be:
a=sin(3*x)
b=3*cos(3*x)
Please tell me what is wrong with my little code! Thank you!

Accepted Answer

More Answers (5)

Andy
Andy on 26 Apr 2014
Please look at the picture attached! You will see what my problem is. Do you have any idea what's wrong?


Walter Roberson
Walter Roberson on 27 Apr 2014
I think maybe you had something in your workspace that was interfering. Did you try clearing all variables, or restarting MATLAB?


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