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Консультация № 67370
17.12.2006, 13:24
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Уважаемые Эксперты, прошу, пожалуйста, помогите решить это задание!
Сравнить бесконечно малой a(x)=x бесконечно малые при х-->0 функции, заданные в:
1. (В примерах За бета обозначу- B)
B1(x) = arctg(x+1)^2
2. B2(x) = √(1-cos2x)
3. B3(x) = √(3+x)
Сравнить бесконечно малой a(x)=x бесконечно малые при х-->0 функции, заданные в:
1. (В примерах За бета обозначу- B)
B1(x) = arctg(x+1)^2
2. B2(x) = √(1-cos2x)
3. B3(x) = √(3+x)
Обсуждение
22.12.2006, 08:54
общий
это ответ
Здравствуйте, Win32.Higrag.exe!
Решение.
1) lim (x→0) α(x)/β1(x)=lim (x→0) x/arctg (x+1)^2=0/arctg 1=0/(π/4)=0, следовательно, α(x)=0(β1(x));
2) lim (x→0) α(x)/β2(x)=lim (x→0) x/sqrt (1-cos (2*x))=lim (x→0) x/((sqrt 2)*(sin x))=(1/sqrt 2)* lim (x→0) x/sin x=1/sqrt 2, следовательно, α(x) и β2(x) – бесконечно малые одного порядка;
3) lim (x→0) α(x)/β3(x)=lim (x→0) x/sqrt(3+x)=0/sqrt 3=0, следовательно, α(x)=0(β3(x)).
С уважением,
Mr. Andy.
Решение.
1) lim (x→0) α(x)/β1(x)=lim (x→0) x/arctg (x+1)^2=0/arctg 1=0/(π/4)=0, следовательно, α(x)=0(β1(x));
2) lim (x→0) α(x)/β2(x)=lim (x→0) x/sqrt (1-cos (2*x))=lim (x→0) x/((sqrt 2)*(sin x))=(1/sqrt 2)* lim (x→0) x/sin x=1/sqrt 2, следовательно, α(x) и β2(x) – бесконечно малые одного порядка;
3) lim (x→0) α(x)/β3(x)=lim (x→0) x/sqrt(3+x)=0/sqrt 3=0, следовательно, α(x)=0(β3(x)).
С уважением,
Mr. Andy.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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