(1+tg*x)*cosx=0
1+tg*x=0
tg*x=-1 cosx=0
х=-п/4+пn x=п/2+пk
x=-5/4п -3/2п
-п/4 -п/2
3/4п п/2
5/4п 3/2п
(1+tg*x)*cosx=0
1+tg*x=0
tg*x=-1 cosx=0
х=-п/4+пn x=п/2+пk
x=-5/4п -3/2п
-п/4 -п/2
3/4п п/2
5/4п 3/2п