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Kaveh
09/27/08 8:38pm

You just need to put a space between -t and Sin[t] - otherwise it believes that you a variable nameed -tSin[t]

v[t_] := -t Sin[t] - 3 t^2 + 5 t
v'[t]
Out[2]: 5 - 6 t - t Cos[t] - Sin[t]

As a rule of thumb, if you define a function, the variable in the function is shown in green (provided you have the default setting in preferences).

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Subject (listing for 'taking the derivative')
Author Date Posted
taking the derivative Aaron 09/25/08 8:20pm
Re: taking the derivative Xavier 09/27/08 12:31pm
Re: taking the derivative Kaveh 09/27/08 8:38pm
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