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→Расчет \tilde{\epsilon}
Обозначим <tex> v = (b - a) \times (c - a) </tex>.
<tex> \tilde{v} = (b_x \ominus a_x) \otimes (c_y \ominus a_y) \ominus (b_y - \ominus a_y) \otimes (c_x \ominus a_x) = </tex>\\<tex> = [ (b_x - a_x) (c_y - a_y) (1 + \delta_1) (1 + \delta_2) (1 + \delta_3) - </tex>\\<tex> - (b_y - a_y) (c_x - a_x) (1 + \delta_4) (1 + \delta_5) (1 + \delta_6) ] (1 + \delta_7), |\delta_i| \leq \varepsilon_m </tex>
<tex> v \approx \tilde{v} </tex>
