Question

2 sinx cosx + 6 cos^2x = 4

Answer 1

2sinxcosx + 6cos^2x=4 , /cos x
2sinx+ 6cosx= 4 /cosx
2tgx= -2
tgx = -2/2
tgx = -1
x= -π/4 +πn, n принадлежит Z