1) tgx=1 2)tgx=-1 3)tgx=0 4)tgx=-2 5)tg^2x-6tgx+5=0 6)tg^2x-2tgx-3=0

1) tgx = 1
x = /4 + n, nZ
2) tgx = - 1
x = - /4 + n, nZ
3) tgx = 0
x = k, kZ
4) tgx = - 2
x = arctg(-2) + k, kZ
x = -arctg(2) + k, kz
5)  tg^2x - 6tgx + 5 = 0
a)  tgx = 1
x1 = /4 + n, nZ
b)  tgx = 5
x2 = arctg(5) + k, kz
6)  tg^2x - 2tgx - 3 = 0
a)  tgx = - 1
x1 = - /4 + n, nZ
b)  tgx = 3
x2 = arctg(3) + k, kz