You should not use e(u). Remove (u) after e. Like this down here:
t = 2*10^-9;
L = 50*10^-6;
R = 50*10^-9;
u = (R+t)^2 - R^2;
e = sqrt( 1 - (( R^2 + u ) / ( (L/2)^2 + u)));
Amid.
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