3 3 14*c - 14*d
14*c^3 - 14*d^3 при c = -1
14*c^3 - 14*d^3
14*(-1)^3 - 14*d^3
-14 - 14*d^3
14.0*c^3 - 14.0*d^3
/ 3 3\ 14*\c - d /
/ 2 2 \ 14*(c - d)*\c + d + c*d/