4. Determine the Euler-Lagrange equation for a functional of the form Fly(x)- | f(x,y,y, , y")dx Hint: you'll have to use integration by parts twice to simplify the y" (x) term.]
Show transcribed image text4. Determine the Euler-Lagrange equation for a functional of the form Fly(x)- | f(x,y,y, , y")dx Hint: you'll have to use integration by parts twice to simplify the y" (x) term.]