Finding the derivative of x·cos(log x)

[karnten07]

Homework Statement

I want to work out the derivative of xcos(log(x))

Homework Equations

The Attempt at a Solution

By using the product rule: and the chain rule;

cos(logx) - xsin(logx).1/x = cos(log(x)) - sin(log(x))

Is this right?

 

[buzzmath]

looks right

 

[karnten07]

looks right

Thankyou