To take an expression e1 to the power e2, enter pow(e1, e2), for example, pow(abs(sin(x)), sin(x)). Other available math functions include abs, sin, cos, tan, acos, asin, atan, atan2, exp, log (natural logarithm), ceil, floor, min, max, random (takes no argument), and sqrt. The following constants are available as well: E. LN2 (natural log of 2), LN10, LOG2E (log base 2 of E), LOG10E (log base 10 of E), PI, SQRT1_2 (square root of 0.5), and SQRT2 (square root of 2).