HP 39gII

178 Using mathematical functions
OR Returns 1 if either value1 or value2 is non-zero, otherwise
returns 0.
value1 OR value2
XOR 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)
ACSC Arc cosecant.
ACSC(value)
ASEC Arc secant.
ASEC(value)
COT Cotangent: cosx/sinx.
COT(value)
CSC Cosecant: 1/sinx
CSC(value)
SEC Secant: 1/cosx.
SEC(value)