HP 39GS hp 39gs_user's guide_English_E_HDPMG39AE13.pdf - Page 171

AND IFTE NOT OR XOR Equals (logical test). Returns 1 if true, 0 if false. value1= = value2 Not equal to. Returns 1 if true, 0 if false. value1≠ value2 Greater than. Returns 1 if true, 0 if false. value1> value2 Greater than or equal to. Returns 1 if true, 0 if false. value1≥ value2 Compares value1 and value2. Returns 1 if they are both non-zero, otherwise returns 0. value1 AND value2 If expression is true, do the trueclause; if not, do the falseclause. IFTE(expression, trueclause, falseclause) Example IFTE(X>0,X2,X3) Returns 1 if value is zero, otherwise returns 0. NOT value Returns 1 if either value1 or value2 is non-zero, otherwise returns 0. value1 OR value2 Exclusive OR. Returns 1 if either value1 or value2-but not both of them-is non-zero, otherwise returns 0. value1 XOR value2 Trigonometry functions The trigonometry functions can also take complex numbers as arguments. For SIN, COS, TAN, ASIN, ACOS, and ATAN, see the Keyboard category. ACOT Arc cotangent. ACOT(value) Using mathematical functions 13-19