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.
Find cot-1 (2.5) rounded to four decimal places. Solution: One approach is to use the identity cot-1 (x) = /2 - tan-1 (x). Using a calculator set in radian mode, we find that tan-1 (2.5) = 1.19028995. Using 3.14159 we get cot-1 (2.5) = (3.14159)/2 â 1.19028995 = 0.3805 (to four decimal places).