The value of \( f(x)=x^{4}+4 x^{3}+2 x^{2}-4 x+7 \), when \( x=\cot \frac{11 \pi}{8} \) is
The value of \( f(x)=x^{4}+4 x^{3}+2 x^{2}-4 x+7 \), when \( x=\cot \frac{11 \pi}{8} \) is
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