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2tg x +3ctg x+5=0
2tg x+3*1/tgx +5=0
tgx=t
2t+ 3*1/t +5=0 /*t
2t^2 +5t +3=0
delta=25-24=1
t1=-5-1 /4 =-6/4 =-1 1/2
t2=-5+1 /4=-4/4 =-1
tgx=-1
x=-pi/4 +kpi
tgx=-1 1/2
x=-56 stopni