Код + скриншот с кодом и выводом компилятора:

x = int(input("Define a constant: x = "))

n = int(input("Enter: n = "))

result = 0

addition = 0

for k in range(0,n+1):

   k_plus_one_fact = 1

   for k_pr in range(1,(k+1)+1):

       k_plus_one_fact *= k_pr

   addition = ((-1)**k)/((k_plus_one_fact)**2)*(((x)/(2))**(2*(k+1)))

   result += addition

print("Result = ",'{:.2f}'.format(result))