The reason that aquarists measure alkalinity is that in normal seawater, most alkalinity consists of bicarbonate and carbonate. Consequently, alkalinity is an indication of whether or not adequate bicarbonate is present in the water. Sodium bicarbonate is the main alkaline buffer in our blood. Alkaline buffers supplied from outside the body, like drinking bicarbonate water, results in a net gain of alkalinity in our body.
The name Xabat is of Spanish origin. The meaning of Xabat is savior. Xabat is generally used as a boy's name. It consists of 5 letters and 2 syllables and is pronounced Xa-bat.
cot is the reciprocal of tan...tan^-1 is simply the inverse...not the inverse as you know it to be but as an undo-er of things to put it simplistic terms. thus many people often prefer to not to use that notation for representing the inverse of the tan function, instead using arctan to denote tan^-1 to avoid confusion.