[tex]\ddot{x}=\dot{z}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

[tex]\ddot{z}=\dot{x}[/tex]

there should be z with a dot above it just like the x, but there is none, and the code is correct as far as I know. Can someone help? Thanks.

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# Decoupled or coupled?

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