If \( (1+\sqrt{1+a}) \tan \alpha=1+\sqrt{1-a} \), then \( \sin 4 \alpha= \)
(A) \( a / 2 \)
(B)
...
If \( (1+\sqrt{1+a}) \tan \alpha=1+\sqrt{1-a} \), then \( \sin 4 \alpha= \)
(A) \( a / 2 \)
(B)
\( \mathrm{a} \) \( 2 \mathrm{a} \)
P
(C) \( a^{2 / 3} \)
(D) \( \quad 2 a \)
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