Help for this infinite integral question ?

erogol · 2009-03-27T22:22:54+00:00

\int (((ax^2)/(x^3)+5) + 2 / x^3) dx (one to infinite integral) find the all possible values of a?

Thread 'How does time derivative commute from one variable to another?'

I'm reviewing Meirovitch's "Methods of Analytical Dynamics," and I don't understand the commutation of the derivative from r to dr: $$ \mathbf{F} \cdot d\mathbf{r} = m \ddot{\mathbf{r}} \cdot d\mathbf{r} = m\mathbf{\dot{r}} \cdot d\mathbf{\dot{r}} $$

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Thread 'How does time derivative commute from one variable to another?'

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