Can someone show me how they got this:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\frac{\omega_n^2}{-\omega^2+j2 \zeta \omega_n \omega}[/tex]

Has this phase:

[tex] -90-tan^{-1} \frac{ \omega}{2 \zeta \omega_n} [/tex]

Why isnt it simply:

[tex] 0 -tan^{-1} \frac{- 2 \zeta \omega_n}{ \omega} [/tex]

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# Phase angle

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