2tgв квадрате x+3 tgx-2=0

2tg^2x + 3tgx - 2 = 0 tgx = t2t^2 + 3t - 2 = 0 D = 9 + 16 = 25t1 = ( - 3 + 5)/4 = 1/2 = 0,5t2 = ( - 3  - 5)/4 = - 8/4 = - 2tgx = 0,5x = arctg(0,5) + pik, k ∈Ztgx = - 2 x = - arctg(2) + pik, k ∈Z