If \( x=(7+4 \sqrt{3})^{2 n}=[x]+f \), where \( n \in N \) and \( 0 \leq f1 \), then \( x(1-f) \...

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If \( x=(7+4 \sqrt{3})^{2 n}=[x]+f \), where \( n \in N \) and \( 0 \leq f1 \), then \( x(1-f) \) is equal to
(a) 1
(b) 0
(c) \( -1 \)
(d) even integer
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