t2乘cost的原函数是多少

如题所述

第1个回答  2016-05-20
∫t^2costdt
=∫t^2dsint
=t^2sint-2∫tsintdt
=t^2sint+2∫tdcost
=t^2sint+2tcost-2∫costdt
=t^2sint+2tcost-2sint
=(t^2-2)sint+2tcost本回答被网友采纳