I'm doing a calculus problem and i found that $\displaystyle x =\frac{\sqrt3}{3}$

in the answer in the back, it says $\displaystyle \frac{1}{\sqrt3}$

I put them both in the calculator and it comes out to be about 0.57....

why did the book put the root in the denominator? i thought it was standard form to have it in the numerator?

not sure where this topic belongs, sorry if in wrong category!