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aa2+1=13, a3a6+a5+a4+a3+a2+a+1= ? \large \frac a{a^2+1} = \frac 1 3, \ \ \ \ \ \frac {a^3}{a^6+a^5+a^4+a^3+a^2+a+1} = \ ? a2+1a=31, a6+a5+a4+a3+a2+a+1a3= ?
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