(6*m - 9*n)/(81*n^2 - 36*m^2) при m = -1/2
(6*m - 9*n)/(81*n^2 - 36*m^2)
(6*(-1/2) - 9*n)/(81*n^2 - 36*(-1/2)^2)
(6*(-1)/2 - 9*n)/(81*n^2 - 36*(-1/2)^2)
(-3 - 9*n)/(-9 + 81*n^2)
(6.0*m - 9.0*n)/(81.0*n^2 - 36.0*m^2)
-3*n + 2*m ----------------- / 2 2\ 3*\- 4*m + 9*n /