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NorthWest UniversityDept. of Math.1NorthWest University3 + y23x = a cos3 ty = a sin3 tFigu re 6:  √y = √x2 + 4a2NorthWest UniversityDept. of Math.3NorthWest Universityx2 + y2 r = a(1 + cos θ)Figu re 13:  r2 = a2 cos 2θ(x2 + y2)2 = a2(x2 − y2)NorthWest University1 + t3y = 3at2ay = aa + e− xDept. of Math.5NorthWest UniversityDept. of Math.6NorthWest UniversityDept. of Math.7