Sin, cos, and tan functions in trigonometry are defined in terms of two of the three sides (opposite, adjacent, and hypotenuse) of a right-angled triangle. Let us understand the formulas to find these ratios in detail in the following sections. We can find the sin, cos and tan values for a given right triangle by finding the required ratio of the sides. Sin, Cos, and Tan values in trigonometry refer to the values of the respective trigonometric function for the given angle. The 'adjacent side' or the base is the side(other than the hypotenuse) that 'touches' the angle.The 'opposite side' or the perpendicular is the side that is just 'opposite' to the angle.We decide the 'opposite' and 'adjacent' sides based upon the angle which we are talking about. We know that the longest side of a right-angled triangle is known as the 'hypotenuse' and the other two sides are known as the 'legs.' That means, in trigonometry, the longest side of a right-angled triangle is still known as the 'hypotenuse' but the other two legs are named to be: Sin, cos, and tan are the three primary trigonometric ratios, namely, sine, cosine, and tangent respectively, where each of which gives the ratio of two sides of a right-angled triangle.
