"Find the root of a real function of a real variable. Returns the argument value of the root and the computed value of the function at that value. The argument and return values may be physical quantities.")
"Find the root of a real function of a real variable. Returns the argument value of the root and the computed value of the function at that value. The argument and return values may be physical quantities. If derivative is nil, the function should return value and derivative as multiple values.")