Limite de functii

[Robert Stanciu]

lim ( 1/sin^2 2x- 1/sin^2 x); x tinde la 0

limita din 1 supra sin patrat de 2x minus 1 supra sin patrat de x.

[DD]

1/[4SIN^2X.COS^2X]-1/SIN^2X=[1/SIN^2X]*{(1-4COS^2X)/4COS^2X=
[SIN^2X-3*COS^2X]/[4SIN^2X*COS^2X]=[1/4COS^2X]-3/[4SIN^2X]-<>1/4-INFINIT->-INFINIT