X(t)=(t+1)u(t-1)-tu(t-1)-u(t-2)
x(t)=cos(t)[u(t+pi/2)-2u(t-pi)]+(cost)u(t-3*pi/2)
谢谢 如果上面的太麻烦 交我怎麽麽画u(t-1)这种基本的即可
完全没有头绪

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