How to find the value of the point A function if the function is given by a formula?

Question

C++ / C#

I don't know how to use the conditional operator to find the function value of point A if the function is given by a
formula.

The task is as follows: The number A is given. Find the value of the function at point A, if the function is
given by the formula:

(I have been sitting for a long time and still can’t understand how to write a program ...)

Answer 1

Here it is necessary to use three constructions of the if...then conditional statement
Right here line by line.
School exercise in informatics lessons.