Question: How do I differentiate an equation with respect to time?

Hi. I have an equation that consists lots of sines and cosines but I'm not sure how to differentiate it with respect to time. Whenever I do, I get zero. How do I communicate to Maple that theta changes with time so that it can perform the operation?

Is there any way to transfer the equation to MATLAB and perform it there by any chance? I don't know MATLAB though.

Thanks in advance.

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