# Math Help - Calculus of Variations

1. ## Calculus of Variations

I have this question which I need some help please, any help will be much appreciated, thanks.

2. Let $F(x,y,y') = \frac{1}{\lambda} \frac{(1+(y')^2)^{1/2}}{y}$.
Now substitute that into the Euler-Lagrange equations.