1. A cosine can be approximated by the following innite series: 1:2 cos x=1- (2,) + (2D - (a + . . . Write a function that will calculate this for any x and y (Note: y is the number of terms for the series). If y > 85 or y is not a positive integer, return an error. Fill in blanks. The approximation error is the difference in values between your function and the excel cos function. Y Cos x osine x, Auroximation error 031831 "_M 095493 -_ _-_ _ _ 1.591549 _- 2.228169 _