Use three 1s and no other digits to make an expression that equals 6.

You can use these only:

parentheses, +, -, /, *, regular factorial sign, square root symbol (or "sqrt"), decimal point (no repeating decimal use), concatenation of digits (if needed)

I am looking for at least three solutions.

This other puzzle is similar:

http://mathhelpforum.com/math-puzzle...-make-6-a.html