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The least positive integer n for which (...

The least positive integer n for which `((1+i)/(1-i))^(n)=(2)/(pi)(sec^(-1)""(1)/(x)+sin^(-1)x)` (where,`Xne0,-1leXle1andi=sqrt(-1),` is

A

2

B

4

C

6

D

8

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