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IF `A^2-2A-1=0`, THEN FIND `A-1/A,A+1/A,A^2+1/A^2` AND `A^2-1/A^2`.
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If `a^2-2A-1=0`, then find `a-1/a,a+1/a,a^2+1/a^2` and `a^2-1/a^2`.
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