f_t(x)\,=\,(x^2-t^2) \cdot e^{-x^2}

1. Ableitung

Tangenten-Dreieck

t = 0.99 (slider from 0.2 to 1.5, step 0.01)
f(x) = (x^(2) - t^(2)) * exp(-x^(2))
f'(x) = f'(x)
a = true
N_1 = Intersect(f, xAxis, (0.9899999999999987, -9.999296580556428E-16))
N_2 = Intersect(f, xAxis, (-0.9899999999999987, -9.999296580556428E-16))
b = Tangent(N_1, f)
c = Tangent(N_2, f)
C = Intersect(b, c)
Vieleck1, a_1, b_1, c_1 = Polygon(N_2, C, N_1)
d = true