C language

4. A certain mathematical function can be approximated by the following series. 4 1 (2)+(21)+(-)-(2) +... 2 If x is input through the keyboard, write a program to calculate the result using the first N terms of this series. Note that if x is 1, the program must ask the user to re-enter the value of x as the function is not defined for such cases. Also, the number of terms N must be greater than or equal to 1. Keep re-entering x and N values until they take valid values and then compute the result. Make sure the calculations are performed on the correct datatypes. You are not allowed to the math.h library file