Write the parametric equations of a unit circle centered at the origin.

r(t)⃗=⟨x(t),y(t)⟩=⟨\displaystyle \vec{{{r}{\left({t}\right)}}}={\left\langle{x}{\left({t}\right)},{y}{\left({t}\right)}\right\rangle}={\langle} , ⟩\displaystyle {\rangle}, for 0≤t≤2π\displaystyle {0}\le{t}\le{2}\pi

 
 

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