\({\rm{cose}}{{\rm{c}}^{ - 1}}\left( {\frac{{1 + {\rm{\;}}{{\rm{x}}^2}}}{{2x}}} \right)\)किसके बराबर है?

1
tan-1 x
2
2 tan-1 x
3
cot-1 x2
4
cot-1 x

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