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posted by Ali on Tuesday, August 6, 2013 at 5:57pm.
Use a formula for slope of a line tangent to a parametric curve to find dy/dx for the curve c(s) = (s^(-1)-6s, -7s^3) at the point with s=-4
dy/dx = (dy/ds)/(dx/ds) = (-21s^2)/(-1/s^2 - 6) now plug in s=-4
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