If \( \tan \alpha=\frac{\sqrt{3}+1}{\sqrt{3}-1} \), then the expres...

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If \( \tan \alpha=\frac{\sqrt{3}+1}{\sqrt{3}-1} \), then the expression \( \cos 2 \alpha+ \)
P \( (2+\sqrt{3}) \sin 2 \alpha \) is

W)
(a) \( 2+\sqrt{3} \)
(b) \( -1 \)
(c) 1
(d) \( -(2+\sqrt{3}) \)
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