導関数，微分係数
y
′
=
3
x
2
−
6
x
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
−1
−2
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
x
3
−
3
x
2
+
1
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
−1
−2
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
p = 1.04
P