Решите неравенство lg(9-2x-x^2) cos^2(x+1)>=1
Lg(9-2x-x^2) cos^2(x+1)≥1 lg((9-2x-x^2)^(cos^2(x+1))≥lg10 (9-2x-x^2)^(cos^2(x+1)≥10 x=-1