| Author |
Comment/Response |
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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