Evaluate the frequency response at ω = 1 rad/s: $H(j)=1/(1+j)$, of magnitude $1/\sqrt2$ and phase −π/4. A stable LTI system responds to a sustained sinusoid at the same frequency, scaled and phase shifted by H. Thus $c_{ss}(t)=\sin(t-\pi/4)/\sqrt2$, D.
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