Powers

x^y raise x to power y.
y can be a decimal number (positive or negative) if x is greater than zero.

 Example 1 :  2 ^ 3 -> 8

 Example 2 :  2 ^ 3.12 -> 8.6938789002

 Example 3 :  pow( 28, -2.5 ) -> 0.00024104877

 Syntax : < x > ^ < y > | pow( x, y )