Math_wam.h includes three functions which returns base raised to 2, 3 and 4. This function is declared as inline and is faster than pow(x,y).
* If the exponent is different to 2, 3 or 4, the standar pow function must be used.
* If the exponent is equal to 0.5 is faster to use sqrt(x) instead of pow(x,0.5)
