The input x(t) and output y(t) of a system are related as y(t) = $ \oint_\infty x(\tau) cos(3 \tau) \ d\tau $the system is
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The input x(t) and output y(t) of a system are related as y(t) = $ \oint_\infty x(\tau) cos(3 \tau) \ d\tau $the system is