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    $\begingroup$ Why not simply differentiating $x(t)= r \cos \omega t, \; y(t)= r \sin \omega t$ twice and see what happens (together with a drawing). $\endgroup$
    – Hyperon
    Commented Feb 28 at 15:10
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    $\begingroup$ Voting to reopen. Clearly a conceptual question not a "do my homework" question. $\endgroup$
    – gandalf61
    Commented Feb 28 at 15:23
  • $\begingroup$ It was a question that came to my mind while I was drawing the differential triangle. The post refers to the question of whether the size of the interval is decisive $\endgroup$
    – Sylvia
    Commented Feb 28 at 15:34
  • $\begingroup$ Clearly conceptual. $\endgroup$
    – Philip Wood
    Commented Feb 28 at 15:36