Решить уравнение tgx-12ctgx+1=0
Tgx-12ctgx+1=0 cosx ≠ 0; sinx ≠ 0 tg²x + tgx - 12 = 0 (tgx + 4)(tgx - 3) = 0 1) tgx = -4 x₁ = arctg (-4) + πn = -arctg 4 + πn; n∈Z 2) tgx = 3 x₂ = arctg 3 + πk; k∈Z