ADVANTAGES

First, let us understand the definition of the Cosin of an angle, we consider a right triangle, from Greek "orthe gonia", the word "right" for the angle in a rectangle with the English word "rectify" which means to make right. The prefix "rect" is Latin and means "right, straight, or erect". Consider the following right triangle Having a right-angle with sides of length A, B, and hypotenuse length C. The Cosine of angle a equals the length of side B divided the length of the hypotenuse C, that is . Similarly, the Sine of angle a equals the length of side A divided the length of the hypotenuse C, that is . However, the Tan of angle a equals the length of side A divided the length of side B that is . Clearly, Tan (a) = Sin (a)/Cos (a), provided Cos (a) is not zero. The inverses of these functions are Arc's functions, i.e. angles. For example, or simply denotes the inverse of Tan (a).

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