 Welcome to this session, let us understand the following problem today. Find the value of the following cot of tan inverse of a plus cot of inverse of a. We will be using the following identity in the problem. Tan inverse of x plus cot inverse of x is equal to pi by 2 where x belongs to r. Now we have cot of tan inverse of a plus cot inverse of a which is equal to cot of pi by 2 which is equal to 0. Therefore, the required answer is 0. I hope you understood the problem. Bye and have a nice day.