Compute the following limits - if possible. State the method(s) you are using, and use proper notation 15. Compute the following limits - if possible. State the method(s) you are using, and use proper notation. (a) lim _x -> 0(e^x-e^-x-2 x/x^2) (b) lim _x -> 0(2 sin (x)+x^2/6 x) (c) lim _x ->infty (ln(x^2+1)/x^2)