1/cos²x=1+tg²x
1+tg²x+2-4tgx=0
tg²x-4tgx+3=0
tgx=y
y²-4y+3=0
D1=4-3=1
y1=2+1=3
y2=2-1=1
tgx=3 tgx=1
x=arctg(3)+ПК x=П/4 +пк
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1/cos²x=1+tg²x
1+tg²x+2-4tgx=0
tg²x-4tgx+3=0
tgx=y
y²-4y+3=0
D1=4-3=1
y1=2+1=3
y2=2-1=1
tgx=3 tgx=1
x=arctg(3)+ПК x=П/4 +пк