数学试题讲解

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已知

θ \in (\frac{3 π}{4}, π), \tan 2 θ = - 4 \tan (θ + \frac{π}{4})

, 则

\frac{1 + \sin 2 θ}{2 \cos^{2} θ + \sin 2 θ} =

\frac{1}{4}

\frac{3}{4}

C. 1 D.

\frac{3}{2}