# The derivative of sin(x)/x^2e^x?

I need to find the derivative of y=(sinx)/(x^2e^x)?

I tried using the product rule on the denominator and then I assume I need to use the quotient rule. But I'm not sure if I use the quotient rule with the derivative I found for the denominator or? I'm confused :$## Answers and Replies Related Calculus and Beyond Homework Help News on Phys.org LCKurtz Science Advisor Homework Helper Gold Member I need to find the derivative of y=(sinx)/(x^2e^x)? I tried using the product rule on the denominator and then I assume I need to use the quotient rule. But I'm not sure if I use the quotient rule with the derivative I found for the denominator or? I'm confused :$
You have the idea. You start differentiating with the quotient rule. In the process of doing that, at the part where you have to differentiate the denominator, right there use the product rule to differentiate the denominator, then continue. So you use the product rule in the middle of doing the quotient rule.