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## Homework Statement

I would like some help on differentiating the lorentz factor with respect to time

## Homework Equations

## The Attempt at a Solution

i arrived at [tex] (-1/2) (1-v^2/c^2)^{-3/2} [/tex]

but a forum on this website says it is [tex] (-1/2) (1-v^2/c^2)^{-3/2} ( \frac{-2v}{c^2} dv/dt)[/tex]

Please help!