In trigonometry, a function of an angle in a
right-angled triangle found by dividing the
length of the hypotenuse (the longest side)
by the length of the side opposite the angle.
Thus the cosecant of an angle A, usually
shortened to cosec A, is always greater than
1. It is the reciprocal of the sine of the
angle, that is, cosec A = 1/sin A.