if a is equal to 3 + root 8 then the value of a minus 1 by a
is equal to
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a=3+√8
a-1/a= 3+√8-1/3+√8
=9+8+6√8/3+√8
17+6√8/3+√8
a-1/a= 3+√8-1/3+√8
=9+8+6√8/3+√8
17+6√8/3+√8
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