Then AB is the longest side and hence it is called the hypotenuse. Let us consider a right triangle ABC that is right angled at C. The sin cos tan formulas are defined for a right triangle. Let's look into the sin, cos, tan formulas in detail. The three other major trigonometric ratios apart from sin, cos and tan are cot, sec, and cosec. These trigonometric ratios are used to calculate the sides of a right triangle. These are three of the six trigonometric ratios which are considered to be the primary functions while solving trigonometric problems. Before going to learn the sin, cos, tan formulas, let us recall what are sin, cos, and tan.
