Question

What is the use of the cos() function?

(a) To find the cosine of a number

(b) To find the sine of a number

(c) To find the tan of a number

(d) To find the inverse cosine of a number

I got this question in an internship interview.

My question is based upon Mathematical Functions in chapter Arduino Programming of Arduino

Answer 1

Correct answer is (a) To find the cosine of a number

The explanation is: The cos() function is used to find the cosine of a number. It takes one argument; the number whose cosine is to be found out. This number is to be entered in the radian format and not the degree format. This function can accept any number-based datatypes and gives the output in the double datatype.