$\displaystyle \int_{\sqrt{x}}^ x \frac{cos z}{z} dz$

I have no idea what to do.

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- Oct 8th 2009, 04:29 PMyoman360derivative of an integral?
$\displaystyle \int_{\sqrt{x}}^ x \frac{cos z}{z} dz$

I have no idea what to do. - Oct 8th 2009, 04:36 PMpickslides
You could try integration by parts in the form

$\displaystyle \int_{\sqrt{x}}^ x z^{-1}\cos( z) ~dz$

or use a series approximation for $\displaystyle \cos(z)$ - Oct 8th 2009, 04:37 PMskeeter
- Oct 8th 2009, 04:56 PMyoman360