(In reply to

Interesting observation by Larry)

Using Excel and substituting "N" in place of "13",** you did not**

ie tan(pi/3) = 3^(1/2) ** you have set 2N+1=13**

The product of the first 2 terms shows equality for N=5.

The product of the first 3 terms shows equality for N=7.

The product of the first 4 terms shows equality for N=9.

The product of the first 5 terms shows equality for N=11.

The product of the first 6 terms shows equality for N=13.

The product of the first 7 terms shows equality for N=15.

So far, I have no idea why

**The product of the first N terms should be = 2N+1**

** I will try to solve it later,** have some ideas but no time now

*Edited on ***August 18, 2014, 10:14 am**