Thread: Delta value

In usual notations Delta = .........

(a) 1- E
(b) E-1
(c) 1 - E^-1
(d) E^-1- 1

I am confused according to me it should be option a

Was there a question associated with this list of options? There are several different math techniques involving " " and " ". The most common is in proving a limit of a funcion: [itex]\lim_{x\to a} f(x)= L[/itex]. But, even then, how and are related depends upon the function f and the point a.