# Math Help - Help with derivatives

1. ## Help with derivatives

I tried deriving this 3 times but i'm not getting the right answer. Can you please help me derive this
$\frac {-48t}{(12 + t^2)^2}$

2. Recall the quotient rule:

$f'(\frac {a}{b}) = \frac {ba'-ab'}{b^2}$

Does this help?