1 - Jacob Pfister
A very well explained and accurate solution. You did a good job of showing how cos(2t) can be written as a linear combination of the given signals, implying that the response to cos(2t) is the same linear combination of the given responses.
Monil Goklani
Your explanation helped me design my own answer in a better way. I knew what the answer was but did not know how to put it i.e the flow of the various steps involved. good job :-)