2 8 9 6 3 -14*b *c *d *9*b *d -------------------- 7
((((((-14*b^2)*c^8)*d^9)*9)*b^6)*d^3)/7 при c = -1/3
((((((-14*b^2)*c^8)*d^9)*9)*b^6)*d^3)/7
((((((-14*b^2)*(-1/3)^8)*d^9)*9)*b^6)*d^3)/7
((((((-14*b^2)*(-1/3)^8)*d^9)*9)*b^6)*d^3)/7
-2*b^8*d^12/729
-18.0*b^8*c^8*d^12