y s s = A [ R e ( G ( i ω ) ) ] 2 + [ I m ( G ( i ω ) ) ] 2 sin ( ω t + ϕ ) {\displaystyle y_{ss}=A{\sqrt {[Re(G(i\omega ))]^{2}+[Im(G(i\omega ))]^{2}}}\sin \left(\omega t+\phi \right)}
and
y s s = A | G ( i ω ) | sin ( ω t + ϕ ) {\displaystyle y_{ss}=A\left|G\left(i\omega \right)\right|\sin \left(\omega t+\phi \right)}
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