(2cosx+1) (3tgx+1)= 0

2cosx + 1 = 03tgx + 1 = 02cosx = -13tgx = -1cosx = -0,5tgx = -1/3cosx = -0,5x=arccos(-0,5) + 2pkx = -arccos(-0,5) + 2pkx1=2p/3 + 2pkx2= -2p/3 + 2pk