How Do You Graph xcos(1/x) by Hand?

[JamesBwoii]

Homework Statement

Draw a graph of xcos(1/x)2. The attempt at a solution

I've differentiated the equation using the product rule.

This got me to:

cos(1/x) + sin(1/x)/x

What I don't know how to do is actually go about drawing the graph. This is also a past paper question for an exam where I won't be allowed calculators.

Thanks!

 

[pasmith]

Homework Statement

Draw a graph of xcos(1/x)


2. The attempt at a solution

I've differentiated the equation using the product rule.

This got me to:

cos(1/x) + sin(1/x)/x

What I don't know how to do is actually go about drawing the graph. This is also a past paper question for an exam where I won't be allowed calculators.

Thanks!

Calculators won't help you with that.

(1) -x \leq x\cos(1/x) \leq x.
(2) \cos(1/x) \to 1 as x \to \infty.
(3) How fast does \cos(1/x) oscillate at x \to 0?