deletions | additions       diff --git a/Ellipsens_ekvation_E_x_frac__.tex b/Ellipsens_ekvation_E_x_frac__.tex  index 0407c10..da36e8d 100644  --- a/Ellipsens_ekvation_E_x_frac__.tex  +++ b/Ellipsens_ekvation_E_x_frac__.tex 
...
We plug this into the expression for $E$,  $$\frac{y_1^2}{t+e_1^2}+\frac{y_2^2}{t+e_2^2}+\frac{y_3^2}{t+e_3^2}-1=0$$  The derivative of the left hand expression above:  $$-\frac{y_1^2}{(t+e_1^2)^2} - \frac{y_2^2}{(t+e_2^2)^2} - \frac{y_3^2}{(t+e_3^2)^2}$ \frac{y_3^2}{(t+e_3^2)^2}$$