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SpaceDomain
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Homework Statement
[tex]
\int_{-\infty}^{\infty}{u(t)e^{-t}(\delta(t+1)+\delta(t-1))dt
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Homework Equations
[tex]
\int_{-\infty}^{t}{u(t)dt = \left\{\begin{array}{cc}0,&\mbox{ if }
t< 0\\t, & \mbox{ if } t>0\end{array}\right.
[/tex][tex]
\int_{-\infty}^{\infty}{f(t)\delta(t-a)dt} = f(a)
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The Attempt at a Solution
[tex]
\int_{-\infty}^{\infty}{u(t)e^{-t}(\delta(t+1)+\delta(t-1))dt
[/tex]
[tex]
= \int_{-\infty}^{\infty}{u(t)e^{-t}{\delta(t+1)dt}
+ \int_{-\infty}^{\infty}{u(t)e^{-t}{\delta(t-1)dt}
[/tex]
I obviously could use the second relevant equation if the u(t) term was not in these integrals.
I am stuck. Could someone point me in the right direction?
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