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Mathematics
Mathematics
Problem
If
x
=
2
−
1
2
+
1
x = \frac{\sqrt{2}-1}{\sqrt{2}+1}
x
=
2
+
1
2
−
1
then
x
3
+
1
x
3
=
x^3 + \frac{1}{x^3} =
x
3
+
x
3
1
=
1) 198 2) 192 3) 99 4) 216
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