# First Derivative problem help

1. Dec 20, 2009

What is the first derivative of

$$x(t) = Acos(wt) + Bsin(wt) + \frac{F}{2mw}tsin(wt)$$

I find:

$$-Awsin(wt) + Bwcos(wt) + \frac{Ftcos(wt)+Fsin(wt)}{2mw}$$

is correct ?

2. Dec 20, 2009

### rochfor1

Re: Derivative

I believe you're missing a factor of w in the first term of the numerator of the fraction.