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that seems to follow logic, what did you do?acmilan said:This is my go at it:
x=a sin t
x2 = a2sin2t
sin2t = x2/a2
cos2t = 1 - x2/a2
y= sec t
y2 = sec2t
y2 = 1/cos2t
y2 = 1/(1 - x2/a2)
y2 = 1/((a2 - x2)/a2)
y2 = a2/(a2 - x2)