I have the equation -tan(x)=x.

I have no idea how to solve it.

The above comes from the derivative of x*sin(x), which is x*cos(x)+sin(x). If we try to find the extremums of x*sin(x) we have:

x*cos(x)+sin(x)=0

x=-tan(x)

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- June 29th 2008, 04:19 AM #1

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- June 29th 2008, 04:32 AM #2