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Здравствуйте, Александр Сергеевич! 6) Коэффициенты степенного ряда cn=1/(([$8730$]n)3n) Радиус сходимости R=lim|cn|/|cn+1|=lim([$8730$](n+1)3n+1)/([$8730$]n)3n=3 Интервал сходимости (-R;R)=(-3;3) Поведение на концах интервала: а) x=-3, получаем ряд с общим членом (-1)n/[$8730$]n. Это знакочередующийся ряд с модулями общего члена (1/[$8730$]n) монотонно убывающими к нулю. По признаку Лейбница ряд сходится. б) x=3, получаем ряд с общим членом 1/[$8730$]n. Это ряд степенного типа 1/n[$945$]. Известно, что при [$945$]>1 ряд сходится, а при [$945$][$8804$]1 ряд расходится. В нашем случае [$945$]=1/2<1 ---> ряд расходится.
Ответ: интервал сходимости (-3;3). При x=-3 ряд сходится, при x=3 ряд расходится.
Находим члены разложения: f(x) = cos2 x, f(0) = cos2 0 = 1; f'(x) = -2 [$183$] cos x [$183$] sin x = -sin 2x, f'(0) = -sin 0 = 0; f"(x) = -2 [$183$] cos 2x, f"(0) = -2 [$183$] cos 0 = -2; f'''(x) = 4 [$183$] sin 2x, f'''(0) = 4 [$183$] sin 0 = 0; fIV(x) = 8 [$183$] cos 2x, fIV(0) = 8 [$183$] cos 0 = 8; fV(x) = -16 [$183$] sin 2x, fV(0) = -16 [$183$] sin 0 = 0; fVI(x) = -32 [$183$] cos 2x, fVI(0) = -32 [$183$] cos 0 = -32; ...
При четырёх членах разложения в ряд в окрестности точки x0 = 0 получаем cos2 x [$8776$] 1 - 2x2/2! + 8x4/4! - 32x6/6! = 1 - x2 + x4/3 - 2x6/45, что при x = x1 = 1 даёт f(1) = cos2 1 [$8776$] 1 - 1 + 1/3 - 2/45 = 13/45.
Для нахождения интервала сходимости разложения запишем его в общем виде: cos2 x = 1 + [$8721$]n = 1[$8734$](-1)n(22n - 1x2n/(2n)!) и выразим коэффициент при общем члене: an = (-1)n(22n - 1/(2n)!).
Тогда при n [$8594$] [$8734$] |an/an + 1| = |(22n - 1/(2n)!) : (22n/(2(n + 1)!)| = 1/2 [$183$] (2n + 1) [$183$] 2(n + 1) = (n + 1)(2n + 1) [$8594$] [$8734$], следовательно, радиус сходимости разложения R = [$8734$], а интервал сходимости - |x| < [$8734$].
Погрешность [$945$], допускаемая при вычислении, меньше абсолютной величины пятого члена разложения, т. е. [$945$] < 27/8! = 128/40320 = 1/315.
С уважением.
5
Об авторе:
Facta loquuntur.
Неизвестный
17.11.2011, 16:35
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это ответ
Здравствуйте, Александр Сергеевич!
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