What is cos 35?

The cosine of 35 degrees is approximately equal to 0.819, which means that it represents the ratio of the adjacent side to the hypotenuse in a right triangle whose angle measures 35 degrees. It is a non-rational number, meaning it cannot be expressed as a simple fraction, and is an irrational number that is not a multiple of pi. Cos 35 can be used in trigonometry to calculate the values of other trigonometric functions, such as sine and tangent, by using the respective formulas.