Differentation problem, when trying to diff sin(f(x)) with variable x

1 vue (au cours des 30 derniers jours)

Andy le 26 Avr 2014

Clôturé : Walter Roberson le 27 Avr 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)

I attach a picture, to see what my problem is.

Please tell me what is wrong with my little code! Thank you!

Walter Roberson le 27 Avr 2014

Cette question est clôturée.

Cette question est clôturée.

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