A parametric representation of the ellipse 9x2 + 4y2 = 16, is given by Or= { cos(t) i + = sin(t) j , te [0 , 2x] Or= cos(t) i + = sin(t) j , te [0 , 2x] Or= -3cos(t) i - 2 sin(t) j , te [0 , 2x] Or= = cos(t) i + 2sin(t) j , te [0 ,2x] Or = 3 cos(t) i + 2 sin(t) j , t c [0 , 2x]