y'=y tgx
dy/y=tgx dx
ln |y| = -ln |cos x| + C1
y=C/cos x
y'cosx - y sinx = y'cosx + y cos'x = (ycosx)' = 0
y cosx = C
y = C / cosx
y'=y tgx
dy/y=tgx dx
ln |y| = -ln |cos x| + C1
y=C/cos x
y'cosx - y sinx = y'cosx + y cos'x = (ycosx)' = 0
y cosx = C
y = C / cosx