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.
The classical definition of the cotangent function for real arguments is: the cotangent of an angle in a rightâangle triangle is the ratio of the length of the adjacent leg to the length to the opposite leg.. This description of is valid for when the triangle is nondegenerate.