If x=1-√2, find the value of (x-1/x)^3...|| rd sharma book question Class 9 ||

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If x=1-√2, find the value of (x-1/x)^3.

|| rd sharma book question Class 9 ||
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Sir but vo Jo last me sign change karte h to USS - ko to + bna diya tha per Aage sign kyun change nhi kia?

rpsingh