求Laplace变换求f(t)=sint•u(t-2)和f(t)=sin(t-2)u(t-2)的Laplace变换(要有步骤),

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求Laplace变换
求f(t)=sint•u(t-2)和f(t)=sin(t-2)u(t-2)的Laplace变换(要有步骤),

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