C# Program to Calculate the Cosine(X) Without Using a Predefined Method

Cosine(x) is also known as Cos(x). It is a trigonometric function of an angle. The ratio of the length of the base to the length of the hypotenuse is known as the cosine of an angle in the right-angle triangle. In this article, we will learn to calculate the Cosine(X) without using a predefined method. So to do this task we use the following formula:

cos(x) = 1.0 - p /2 + q /24 - p * q /720 + q * q /40320 - p * q * q /3628800

Example:

Input : cos(45)
Output : 0.7071

Input : cos(0)
Output : 1

Code:

Output:

Cos(0):1
Cos(3):0.540302303791887
Cos(8):-0.41615520282187