Raises Base to any power.

function Power(const Base: Extended; const Exponent: Extended): Extended; overload;
function Power(const Base: Double; const Exponent: Double): Double; overload;
function Power(const Base: Single; const Exponent: Single): Single; overload;

Extended Power(const Extended Base, const Extended Exponent);
Double Power(const Double Base, const Double Exponent);
Single Power(const Single Base, const Single Exponent);