Trig ratios are ratios of the sides of a right triangle. COTS, COTANS, SINES, and SECANTS are all trig ratios that can be used to calculate the angles and sides of a right triangle. COTS stands for 'co-tangents', which is the ratio of the adjacent side to the opposite side of a right triangle. COTANS stands for 'co-tangent of an angle', which is the ratio of the adjacent side to the hypotenuse of a right triangle. SINES stands for 'sine of an angle', which is the ratio of the opposite side to the hypotenuse of a right triangle. Finally, SECANTS stands for 'secant of an angle', which is the ratio of the hypotenuse to the opposite side of a right triangle.