- (a) Write the corresponding rectangular equation by eliminating the parameter, (b) sketch the curve and indicate the directions of increasing parameter, {c} Use the equations to nd FF 3: and :43 at to = E! and {d} the equation of the tangent line at the point on the curve corresponding to the parameter value to . I = 3csc{t) 1. y = 2mm) + 3, to = 1