導関数，微分係数
y
′
=
−
6
x
2
+
6
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
0.5
1
1.5
2
2.5
−0.5
−1
−1.5
−2
−2.5
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
−
2
x
3
+
6
x
+
1
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
0.5
1
1.5
2
2.5
−0.5
−1
−1.5
−2
−2.5
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
p = 0.00
P