# How can I tell mathematica that $a, \space b, \space \omega$ are constants? [closed]

I want to differentiate the following vector:

$$=\frac{1}{\sqrt{a^2\omega^2\sin^2(\omega t)+b^2\omega^2\cos^2(\omega t)}}\begin{pmatrix}-a \omega \sin(\omega t)\\b \omega \cos (\omega t)\end{pmatrix}$$

However if I type this into mathematica then mathematica doesn't recognize that $\omega$ and $a,b$ are constants. Any idea how I can tell mathematica that they are constants?

## closed as off-topic by m_goldberg, Karsten 7., user9660, Kuba♦, Sjoerd C. de VriesOct 18 '15 at 14:10

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "This question arises due to a simple mistake such as a trivial syntax error, incorrect capitalization, spelling mistake, or other typographical error and is unlikely to help any future visitors, or else it is easily found in the documentation." – m_goldberg, Karsten 7., Community, Kuba, Sjoerd C. de Vries
If this question can be reworded to fit the rules in the help center, please edit the question.

    SetAttributes[{a, b, ω}, Constant]