Simple Integral

Hey, not really homework but I am just having a total mind blank and would be grateful if someone could help me.
$$\int\left(\frac{dx}{dt}\right)^{2}dt=?$$
I even have the answer my brain is just refusing to play along though and I just can't picture how to work it out properly at the moment.
Thanks!

rock.freak667
Homework Helper
try writing it as

$$\int \frac{dx}{dt} \frac{dx}{dt} dt$$

try writing it as

$$\int \frac{dx}{dt} \frac{dx}{dt} dt$$

$$\int \frac{dx}{dt}dx$$