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2.5 曲線の概形

1.

(a) $\displaystyle{x = \frac{1}{3}, y = \frac{1}{3}}$ (b) $\displaystyle{x = 2, y = x+2}$ (c) $\displaystyle{x = \pm 3, y = 0}$

2.

(a) $x = 0$で垂直接線．(b) $x = 0$で垂直カスプ． =2.6zw =1(c) $x = 2$で垂直カスプ．