(a-1/a)²=
a²-2+ 1/a²=5 === a² + 1/a²= 7
( a² + 1/a²)²=
a⁴+2+ 1/a⁴ =49 ====a⁴+ 1/a⁴=47
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(a-1/a)²=
a²-2+ 1/a²=5 === a² + 1/a²= 7
( a² + 1/a²)²=
a⁴+2+ 1/a⁴ =49 ====a⁴+ 1/a⁴=47