tgX - 3ctgX = 2
tgX - 3/tgX = 2
tg²X - 3 = 2tgx
tg²X - 2tgX - 3 = 0
(tgX - 3)(tgX +1) = 0
tgX = 3 ili tgX = -1
X₁ = arctg3 X₂ = 135
Смотри...............
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