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求图8.1所示周期函数的拉氏变换. 求下列图8.2所示函数f(t)的拉氏变换.
求下列图8.2所示函数f(t)的拉氏变换.
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求下列图8.2所示函数f(t)的拉氏变换.
求下列函数的拉氏变换. (1)f(t)=t3-2t+2; (2)f(t)=1-tet; (3)f(t)=(t-1)2et;
(5)f(t)=t sin(at); (6)f(t)=e-2tsin 6t; (7)f(t)=tneat; (8)f(t)=u(1-e-t).
求下列卷积: (1)1*1; (2)t*t; (3)tm*tn; (4)sint*cost.