導関数，微分係数
y
′
=
3
x
2
−
6
x
−
9
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
−1
−2
10
−10
−20
−30
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
x
3
−
3
x
2
−
9
x
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
−1
−2
10
−10
−20
−30
0,0
–
o
+
←
↓
↑
→
x
y
p = 1.53
P