導関数，微分係数
y
′
=
−
2
(
x
−
3
)
x
4
−
x
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
0.5
1
1.5
2
2.5
3
3.5
4
4.5
−0.5
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
x
4
x
−
x
2
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
0.5
1
1.5
2
2.5
3
3.5
4
4.5
−0.5
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
p = 1.98
P