If sin<sup>2</sup> x tan x + cos<sup>2</sup> x cot x - sin 2x = 1 + tan x + cot x, x ϵ (0, π), then x
(A) <span class="math-tex">\(\frac {3\pi}{12}, \frac {5\pi}{12}\)</span>
(B) <span class="math-tex">\(\frac {5\pi}{12}, \frac {7\pi}{12}\)</span>
(C) <span class="math-tex">\(\frac {7\pi}{12}, \frac {11\pi}{12}\)</span>
(D) <span class="math-tex">\(\frac {7\pi}{12}, \frac {9\pi}{12}\)</span>