小編注：哇咔咔，同學(xué)們，高中數(shù)學(xué)還記得多少？被函數(shù)（function）折磨得死去活來的日子還有印象嘛？其實一早就可以用跳舞的方法來學(xué)函數(shù)喔~于是上面這些人物造型圖，有沒有讓你回憶起三角函數(shù)（trigonometric function）、二次函數(shù)（quadratic function）、冪函數(shù)（power function）、圓方程等等的函數(shù)圖象（graph）？

下面來看國外網(wǎng)友對這張圖示的評論吧：

The third to last panel is an imaginary number.Shouldn't it be -SQRT(x)?
倒數(shù)第三張圖是錯的吧？難道不應(yīng)該是-√x 嘛？（根號中的數(shù)字不能為負值）

Only for x > 0. For x < 0 it is real.
這里X取小于零的數(shù)值就可以成立了

-SQRT(x) would be SQRT(x) flipped over the x axis.
-√x的函數(shù)圖像與√x的函數(shù)圖象是關(guān)于Y軸對稱的。

He should have put sqrt(x2) - would have been a lot easier and could have formed a C!
應(yīng)該把√x2 的圖象放上去，那就是一個對稱的C形！

sqrt(x2 ) would be just like the absolute value. You want ±sqrt(x).
樓上的你說錯了，C形的話應(yīng)該是±√x的圖象。

Actually it doesn't matter if x is >0 or <0 because the number gets squared and then the - is applied.
X大于零小于零都木有關(guān)系啦，總之都已經(jīng)平方了，然后又加了負號。

The number is not squared.
哪里有平方啊……

You're right. What was I thinking? Forget everything I said.
呃，你說得對，瞧我，腦子秀逗了一下，算了別管我剛才瞎扯的那些。

Slightly relevant occurrence: I opened this while watching Carnivale, and a character said "it's a sin" right as I looked at the first one. Weird.
話說我正一邊看Carnivale一邊打開這個，剛看到sin(x)，節(jié)目里的一個角色就說了一句it's a sin. 好巧！

Yeah but sin(x) is pronounced like "sign"
樓上的，其實這里的sin發(fā)音是類似于“sign”的。