2·TAN(x + pi/4) > 1
2·(TAN(x) + TAN(pi/4))/(1 - TAN(x)·TAN(pi/4)) > 1
2·(TAN(x) + 1)/(1 - TAN(x)·1) > 1
TAN(x) = t
2·(t + 1)/(1 - t) - 1 > 0
(3·t + 1)/(1 - t) > 0
- 1/3 < t < 1----> - 1/3 < TAN(x) < 1
ATAN(- 1/3) + k·pi < x < pi/4 + k·pi
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