[Python] I keep getting an invalid syntax and, I don't know why I am getting it [closed]

I have been working on this problem for a long time and trying to get it to work. It is the line that is pointed at.

print("Only enter the numbers between 1-8.")
print("Select an operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")
print("5. Detect prime numbers")
print("6. Generate prime factors")
print("7. Simplify square roots")
print("8. Solve for a variable")

choice = input("Enter your choice (1-8): ")

if choice in ('1', '2', '3', '4', '5', '6', '7', '8'):
if choice == '1':
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
print(num1, "+", num2, "=", num1 + num2)

elif choice == '2':
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
print(num1, "-", num2, "=", num1 - num2)

elif choice == '3':
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
print(num1, "*", num2, "=", num1 * num2)

elif choice == '4':
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
if num2 == 0:
print("Cannot divide by zero")
else:
print(num1, "/", num2, "=", num1 / num2)

elif choice == '5':
num = int(input("Enter a number: "))
print(f"You entered: {num}")
if num <= 1:
print(num, "is not a prime number")
elif num <= 3:
print(num, "is a prime number")
elif num % 2 == 0 or num % 3 == 0:
print(num, "is not a prime number")
else:
i = 5
while i * i <= num:
if num % i == 0 or num % (i + 2) == 0:
print(num, "is not a prime number")
break # Important: Break out of the loop if a divisor is found
i += 6
else:
print(num, "is a prime number")

> elif choice == '6':

def prime_factors(n):
factors = []
d = 2
while d * d <= n:
while n % d == 0:
factors.append(d)
n //= d
d += 1
if n > 1:
factors.append(n)
return factors
num = int(input("Enter an integer greater than 1: "))
if num <= 1:
print("Please enter an integer greater than 1.")
else:
print("Prime factors:", prime_factors(num))

elif choice == '7':
print("This option is not yet implemented.")

elif choice == '8':
print("This option is not yet implemented.")

else:
print("Invalid input")


I also have other errors in it as well, but this one I need the most help on because I don't know what to do at all. The one that has an arrow is the line I need help on.

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