The function y= `x*sin(1/x)`
Use the product rule and the chain rule to determine the derivative.
y' = `1*sin(1/x) + x*cos(1/x)*(-1/x^2)`
=> `sin(1/x) - cos(1/x)/x`
The derivative of y= `x*sin(1/x)` is y' = `sin(1/x) - cos(1/x)/x`
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