only questions 11, 13, 15, 17

(a) Eliminate the parameter to find a Cartesian equation of the curve. (b) Sketch the curve and indicate with an arrow the direction in which the curve is traced as the parameter increases. 11. x = sin 70, y = cos 70, -T 0 - T 12. x = 5 cos0, y = 2 sin0, 0 0 - T 13. x = sint, y = csc t, 0