y=|x|

点Aを動かしてみよう．

f(x) = abs(x)
A = Point(xAxis)
B: (x(A), abs(x(A)))
a = Segment(A, B)
C: (0, y(B))
b = Segment(B, C)
c: x(A)
d: y(C)
テキスト3: "y=|x|=" + (LaTeX[d]) + ""
テキスト2: "x=" + (LaTeX[c]) + ""