Asymptotes in Parametric Coordinates

Let the curve be given by x = f ( t ), y = ɸ ( t ) Asymptotes parallel to the coodinate axes . If as t → t l , y = ɸ ( t )→∞ while x = f ( t )→ a , where a is finite, then x = a is an asymptote. If as t→t 2 , x = f ( t )→∞while y = ɸ( t )→ b , where b is finite, then y = b is an asymptote.