To supply an angle to SIN in degrees, multiply the angle by PI()/180 or use the RADIANS function to convert to radians. I am in a project and have to find out the value of cos of an angle. The Excel SIN function returns the sine of angle given in radians. What is value of sin 30?What about cos 0?and sin 0?How do we remember them?Let's learn how. As A increases AB decreases (while AC is constant), thus the ratio AB/AC reduces. Formula that uses the IF function P: n/a Bindul Bhowmik. all has to do with IEEE 754 and the way Excel (and most other computer apps) convert decimal numbers (numbers using base 10) to binary numbers (numbers using base 2). Using Math.Cos function in C# for value 90 degree. The user will input the value of the angle only in degrees. For example, if I enter =sin(30) in a cell and then move cells, the number in the first cell is -.98803. Imagine a right angled triangle which has of course 3 sides, Which we will call "x" for the horizontal side, "y" for the vertical side and "h" for the third side (hypotenuse). cos A = AB/AC. You can use the AND, OR, NOT, and IF functions to create conditional formulas.. For example, the IF function uses the following arguments.. How do you use the reference angles to find #sin210cos330-tan 135#? Learn more Why does Math.cos(90 * Math.PI/180) yield 6.123031769111… and not zero? How do you know if #sin 30 = sin 150#? Similarly, if I enter =cos(30), the number returned is .154251. How do you find the trigonometric functions of values that are greater than #360^@#? Consider a right angle triangle ABC, with