In this example, cell B2 contains the value of the angle for which cosine is to be calculated. Cell C2 has a COS formula associated with it, which is RADIANS. Get more information on cos 90 degrees and other trigonometric functions, visit BYJU’S and also watch the interactive videos to clarify the doubts. Therefore, the value of cos 90 degrees is: It is observed that the values of sin and cos functions do not change if the values of x and y are the integral multiples of 2π. This means that the length of the arc AP equals to x. COS Excel function is an inbuilt trigonometric function in excel which is used to calculate the cosine value of given number or in terms or trigonometry the cosine value of a given angle, here the angle is a number in excel and this function takes only a single argument which is the input number provided. COS in excel is assigned to cell D2. RADIANS(B2) is 0. COS in excel is assigned to the D3 cell. The three sides of the triangle are defined as follows: The opposite side is a side which is opposite to the angle of interest. For example, the cosine of PI()/6 radians (30°) returns the ratio 0.866. Hence val1 holds value 1. In this example, cell B5 contains the value of the angle for which cosine is to be calculated. The Excel ACOS function calculates the arccosine (i.e. For cos For memorising cos 0°, cos 30°, cos 45°, cos 60° and cos 90° Cos is the opposite of sin. It is categorized under Math Functions in MS Excel. The COS in excel can be used in Excel VBA as follows. All the sine and cosine functions in the first quadrant take the form √(n/2) or √(n/4). Here, let us discuss the value for cos 90 degrees which is equal to zero and how the values are derived using the quadrants of a unit circle. Get the cosine of an angle provided in radians. Refer to the examples given below to understand better. If the angle is in degrees, it must be calculated using the RADIANS function or multiply the angle by PI ()/180. The parameter is the value of the angle for which the cosine is to be calculated. The syntax of the function is: ACOS( number ) Cell C6 has a COS formula associated with it, which is B6*PI ()/180. Cell C4 has a COS formula associated with it, which is RADIANS. the inverse cosine) of a given number, and returns an angle, in radians, between 0 and π. From this, we define the value that cos x = a and sin x = b. Cos 90 degrees. As the third side of the triangle does not exist (length is 0), the cosine equals zero (0 divided by the length of the hypotenuse equals 0). The COS Formula in excel has one argument, which is a required parameter. Once we find the values of sine functions it is easy to find the cosine functions. RADIANS(B3) is 0.523598776. 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