導関数，微分係数
y
′
=
−
3
+
x
9
−
(
−
3
+
x
)
2
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
6
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
9
−
(
x
−
3
)
2
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
6
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
p = 3.04
P