xA

f'(xA)

A = Point(c)
a = Tangent(A, c)
A2 = -3
A3 = -2
A4 = -1
A5 = 0
A6 = 1
A7 = 2
A8 = 3
B2 = -6
B3 = -4
B4 = -2
B5 = 0
B6 = 2
B7 = 4
B8 = 6
P_1: (A2, B2)
P_2: (A3, B3)
P_3: (A4, B4)
P_4: (A5, B5)
P_5: (A6, B6)
P_6: (A7, B7)
P_7: (A8, B8)
P_8: (A2, B2)
P_9: (A3, B3)
P_{10}: (A4, B4)
P_{11}: (A5, B5)
P_{12}: (A6, B6)
P_{13}: (A7, B7)
P_{14}: (A8, B8)
liste1: {P_8, P_9, P_{10}, P_{11}, P_{12}, P_{13}, P_{14}}
b = FitLineY(liste1)