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The helix of radius $R$, height $h$, and $N$ complete turns has the parametrization $r(t)=?Rcos(h2?Nt?),Rsin(h2?Nt?),t?,0?t?h$ Calculate the length $s$ of a helix if $R=8,h=19$, and $N=10$. (Use symbolic notation and fractions where needed.)

Solution :- We have r(t)=?8cos?(20?t19),8s