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Здравствуйте, John_the_Revelator! Воспользуемся применением комплексных чисел. Согласно формуле Эйлера e([$945$]+i[$946$])x=e[$945$]x(cos[$946$]x+isin[$946$]x). Кроме того, при любом комплексном z ez=[$8721$]n=0[$8734$]zn/n!, поэтому при всех x f(x)=Im(e(4+2i)x)=Im[[$8721$]n=0[$8734$]((4+2i)n/n!)xn] Для вычисления степени комплексного числа можно воспользоваться формулой Муавра zn=|z|n(cos(n arg(z))+i*sin(n arg z)) где z=4+2i |z|=[$8730$](16+4)=2[$8730$]5 arg(z)=arctg(2/4)=arctg(1/2) Таким образом zn=(2[$8730$]5)n(cos(n arctg(1/2))+i*sin(n arctg(1/2))) и поэтому f(x)=[$8721$]n=0[$8734$][(2[$8730$]5)nsin(n arctg(1/2))/n!]xn
Так как ряд для показательной функции сходится всюду, то промежуток сходимости равен (-[$8734$];+[$8734$])
В задании требуется не только представить функцию в виде степенного ряда, но и найти его область сходимости.
С уважением.
Об авторе:
Facta loquuntur.
Неизвестный
23.05.2011, 21:22
общий
Здравствуйте, уважаемые эксперты!
Вообще, задание дал нам преподаватель, но занимаемся мы по Демидовичу.
Извините, но можно ли решить, разложив экспоненту и синус в ряд Тейлора, а потом через произведение рядов? А разве через формулу Эйлера и формулу Муавра можно решить, если степень и аргумент в синусе разные?
А Вы смотрите в решение. Если посмотреть еще куда-нибудь, то можно найти еще много чего: и произведение трех рядов и четырех и то, как космические корабли бороздят Большой театр.
Дмитрий Германович, мы говорим о разных вещах. В Вашем решении, безусловно, один ряд Лично меня Ваше решение устраивает... Два ряда возникли из просьбы посетителя: На который Вы, кстати, не ответили... А усмотрели "двурядный" взгляд на свое решение
Об авторе:
"Если вы заметили, что вы на стороне большинства, — это верный признак того, что пора меняться." Марк Твен
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