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The step response of a linear time-invariant system is given as

s(t)=t*e^(-2t) u(t)

Determine the response of the system to the following inputs:

a. x(t)=sin(3t) u(t)

b. x(t)=tri(t-1)

As of now I see this problem and I have no idea what it means...I tried looking in my textbook but the book is poorly written so that confuses me more and oh yeah, my teacher is horrible. But I'm trying to put in an effort to learn on my own, hopefully it's possible...

Any help with this is truely appreciated.

Also, if there are any websites that you guys know of that can help me with Signals and Systems that would be great!