$ \left(  T) $

$ \left(  T')  $

$ \left(  Cf)  $

$ \vec{i} $

$ \vec{j} $

$ \left(  \Delta)  $

f(x) = (2 - x) * (exp(x) + 1)
A: (1, f(1))
d = Tangent(A, f)
i = (1, 0)
j = (0, 1)
B = Point(f)
m = 3 (slider from -6 to 6, step 0.01)
B_1 = Intersect(c, yAxis)
D = Intersect(f, b, (1.6368445121765452E-5, 3.999999999999999))
g(x) = -x + m
M_1, M_2 = Intersect(f, g, -10, 10)