Ski pente et dérivée

f(x) = x sin(x) / 3
A = Point(f)
c = 0.8999999999999988
a: x(A)
g = Derivative(f)
T = Tangent(a, f)
s = Slope(T)
b = -5
B: (a, b)
C: B + (0, s)
S = Segment(B, C)
CP = If(y(C) > y(B), C)
CN = If(y(C) < y(B), C)
SP = Segment(B, CP)
SN = Segment(B, CN)