If a=3-2√2, find the value of a²-1÷a²
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Step-by-step explanation:
a=3-2√2
a²-1/a²=(3-2√2)²-1/(3-2√2)²
=9+8-12√2-1/9+8-12√2
=17-1-12√2/17-12√2
=16-12√2/17-11√2
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