A cactus (plural: cacti, cactuses, or cactus) is a member of the plant family Cactaceae,[Note 1] a family comprising about 127 genera with some 1750 known species of the order Caryophyllales.
'cot' and 'crib' In British English, a cot is a bed for a baby. A cot has high sides to prevent the baby from falling out. In American English, a bed like this is called a crib.
cot(x) represents the cotangent function cos(x)/sin(x). Specify the argument x in radians, not in degrees. For example, use Ï to specify an angle of 180o. All trigonometric functions are defined for complex arguments. Floating-point values are returned for floating-point arguments.