cos7x^(1/2)*sin7x=(*)
Проводим замену:
t=cos7x
dt=-7sin7xdx -> sin7xdx=-dt/7
(*)=-1/7∫sqrt(t)dt=-1/7*2/3*t^3/2+c=-2/21*cos7x^3/2+c
Верно.
данке)
Русская версия Invision Power Board (http://www.invisionboard.com)
© Invision Power Services (http://www.invisionpower.com)