convert parametric to cartesian (an exam problem), x=sec(t), y=csc(t)

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convert parametric to cartesian (an exam problem),
convert parametric equation to cartesian equation,
x=sec(t), y=csc(t)

S. Chow
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solved this one with cos^2t + sin^2t = 1 and got the same result :)
nice video<3

rot