please, solve this questions.

this is C++ programming.

provide correct answers and clear explanation. thank you in advance.

Problem 3. Write a short program following the instructions below. Specify the libraries (a) Program that prompts the user for a positive floating-point number x and then outputs x1.75- cos(x) + needed. on the console the result of 2 If the user inputs a non-positive number then the ouput must be 0. (b) Program that asks the user "How are you feeling today?", then accepts a response on the nert line, which can be a full sentence, and follows it by a reply (again on the line following the response): "Sorry, but Computer does not understand emotions