If $$x=( sqrt2+1)^{1 over3} $$, the value of $$(x^3-{1 over {x^3}}) $$ is

If $$x=( sqrt2+1)^{1 over3} $$, the value of $$(x^3-{1 over {x^3}}) $$

1.	If $$x=( sqrt2+1)^{1 over3} $$, the value of $$(x^3-{1 over {x^3}}) $$ is
A.	0
B.	$$- sqrt { 2} $$
C.	2
D.	$$3 sqrt { 2} $$
Answer» D. $$3 sqrt { 2} $$