那天觀課，同事教 trigonometric graphs。談到 tangent graph 在 90 度處斷開，著同學試 tan(89∘), tan(89.9∘), tan(89.99∘) 之類，可見結果愈來愈大，去到 90 就無限大云云。
N 日後，有學生問我，何解相鄰結果似乎有 10 倍變化？見下：
當時我只叫他自行證明，現略答如下。
修 M2 的同學知：
意思是當 
於是
同學，看到那 10 倍關係嗎？
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