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That's a wonderful multiplication rule / chain rule. Let's see what you get.
x*cos(-3/x^2)+1*sin(3/x)
Originally Posted by FamousDrumFreak x*cos(-3/x^2)+1*sin(3/x) The first term is wrong. Use the chain rule to get the derivative of $\displaystyle \sin \left(\frac{3}{x}\right)$.
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