if a=2+root3 then find a-1/a?????
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a=2+
1/a= 1/2+
Therefore, 1/a=
-2
a-1/a=2+
-(
-2)
=2+
-
+2
=4
1/a= 1/2+
Therefore, 1/a=
a-1/a=2+
=2+
=4
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