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Найти неопределённые интегралы. Результат проверить дифференцированием: а) [$8747$](cos x)dx/([sup]5[/sup][$8730$](sin[sup]2[/sup] x); б) [$8747$](ln x)dx/(2[$8730$]x).
Рассмотрим первый интеграл. Положим u = sin x. Тогда (cos x)dx = du, 1/5[$8730$](sin2 x) = u-2/5, поэтому [$8747$](cos x)dx/(5[$8730$](sin2 x) = [$8747$]u-2/5du = u-2/5 + 1/(-2/5 + 1) + C = u3/5/(3/5) + C = 55[$8730$](sin3 x)/3 + C.
Проверим полученный результат дифференцированием: ((5/3)5[$8730$](sin3 x)/3 + C)' = (5 [$183$] (sin x)3/5 + C)' = 5/3 [$149$] 3/5 [$183$] (sin x)3/5 - 1 [$183$] cos x = (sin x)-2/5 [$183$] cos x = (cos x)/(5[$8730$](sin2 x), как и должно быть.
Рассмотрим второй интеграл. Имеем dx/(2[$8730$]x) = d([$8730$]x) = dv. Обозначим u = ln x (тогда du = dx/x) и применим интегрирование по частям: [$8747$](ln x)dx/(2[$8730$]x) = [$8730$]x [$183$] ln x - [$8747$][$8730$]xdx/x = [$8730$]x [$183$] ln x - [$8747$]dx/[$8730$]x = [$8730$]x [$183$] ln x - 2[$8730$]x + C.
Проверим полученный результат дифференцированием: ([$8730$]x [$183$] ln x - 2[$8730$]x + C)' = (x1/2ln x - 2x1/2 + C)' = (1/2)x-1/2ln x + x1/2x-1 - x-1/2 = (ln x)/(2[$8730$]x) + x-1/2 - x-1/2 = (ln x)/(2[$8730$]x), как и должно быть.
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