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i have a question regarding bode plot

g(s)= 1/(s^{2}+4)

i did get the magnitude plot correct but i am unable to understand the phase plot. by calculating on paper i got 0° but in matlab it changes from -360° to -180°

i havent understood how the initial phase is -360 which changed to -180 at the corner frequency(2)

please explain. i would really appreciate if you could explain me how to draw the phase plot for second order system with ς‚= 0

thank you in advance

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# Bode plot

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