Question: For a wing with modified elliptic loading such that, at distance y from the center of the span, the circulation is given by
![2304_Zeta.png](https://secure.tutorsglobe.com/CMSImages/2304_Zeta.png)
where s is the semi-span, show that the downward induced velocity at y is
![886_Zeta 1.png](https://secure.tutorsglobe.com/CMSImages/886_Zeta 1.png)
Also prove that for such a wing with aspect ratio AR, the induced drag coefficient at lift coefficient is
![448_Cd.png](https://secure.tutorsglobe.com/CMSImages/448_Cd.png)