導関数，微分係数
y
′
=
−
2
x
+
4
(接線の傾き)
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
−1
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
P'
y
=
−
x
2
+
4
x
2
−
3
JSXGraph v1.2.2 Copyright (C) see https://jsxgraph.org
1
2
3
4
5
−1
5
−5
0,0
–
o
+
←
↓
↑
→
x
y
p = 2.00
P