This function takes two numbers as parameters, the first number being the coefficient, and the second number being the exponent.
Your function should multiply the two numbers, and then subtract 1 from the exponent. Then, it has to print out an expression (like 28x^7). `"^1"` should not be truncated when exponent = 2.
For example:
```
derive(7, 8)
```
In this case, the function should multiply 7 and 8, and then subtract 1 from 8. It should output `"56x^7"`, the first number 56 being the product of the two numbers, and the second number being the exponent minus 1.
```
derive(7, 8) --> this should output "56x^7" 
derive(5, 9) --> this should output "45x^8" 
```
**Notes:**
* The output of this function should be a string
* The exponent will never be 1, and neither number will ever be 0
def derive(coefficient, exponent):
    new_coefficient = coefficient*exponent
    new_exponent = exponent-1
    ans = str(new_coefficient)+"x^" + str(new_exponent)
    return ans

def derive(coefficient, exponent):
    new_coefficient = coefficient*exponent
    new_exponent = exponent-1
    ans = str(new_coefficient)+"x^" + str(new_exponent)
    return ans
