Math Help - first principle

1. first principle

$\frac{\tan{x}}{x}$ prove this using the first principle... how can we do this????

2. Re: first principle

Originally Posted by srirahulan
$\frac{\tan{x}}{x}$ prove this using the first principle... how can we do this????
prove what?

3. Re: first principle

What are we trying to prove? And what is the first principle?