The HCF of the polynomials \( x^{4}+6 x^{2}+25 \), \( x^{3}-3 x^{2}+7 x-5 \) and \( x^{2}+5-2 x ...

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The HCF of the polynomials \( x^{4}+6 x^{2}+25 \), \( x^{3}-3 x^{2}+7 x-5 \) and \( x^{2}+5-2 x \) is
(a) \( x^{2}-2 x-5 \)
(b) \( x^{2}-2 x+5 \)
(c) \( x-1 \)
(d) \( 3 x+2 \)
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