an unfair calculus 1 homework question

I told my calculus 1 students to omit this homework question, i.e. finding the second derivative of x^2/(1+e^x) by using the quotient rule. We can just use the quotient rule to get the first derivative pretty easily but I think the second derivative is very unfair. Not only the process is quite long, but only I can see many of the students will make mistakes when they find the derivative of (1+e^x)^2 because we haven't covered the chain rule for finding the derivative yet.

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