2cos x + cos^2 x = 0
t = cos x
t^2 + 2t = 0
D = 4 - 4*1 = 0
t = -2 / 2 = -1
t = cos x = -1
x = π + 2kπ, k ∈ Z
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2cos x + cos^2 x = 0
t = cos x
t^2 + 2t = 0
D = 4 - 4*1 = 0
t = -2 / 2 = -1
t = cos x = -1
x = π + 2kπ, k ∈ Z