Differentation problem, when trying to diff sin(f(x)) with variable x
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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)
I attach a picture, to see what my problem is.
Please tell me what is wrong with my little code! Thank you!
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