Matlab 拉氏变换我的输出结果中怎么还有laplac.如:>> syms t s>> ft=sym('sin(t)*Heaviside(t)');>> Fs=laplace(ft)Fs =- (laplace(Heaviside(t),t,s - i)*i)/2 + (laplace(Heaviside(t),t,s + i)*i)/2这怎么让他算完?

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