task/29999191
iim (1 - √cos2x) /x² x→ 0
(1 -√cos2*0) /0² = (1 - 1) /0 =0/0 неопределенность типа 0/0
lim (1 - √cos2x) /x² = lim (1 - √cos2x)(1+√cos2x) /x²(1+√cos2x) =
lim (1 - cos2x) / x²(1+√cos2x) =lim 2(sin(x) / x)²*1 /(1+√cos2x) =
lim (sin(x) / x)²* 2 / (1+√cos2x) = 1* 2/(1+√cos2*0)=1* 2/(1+1) =1.
везде x →0
ответ : 1