Teaching EMRS PGT Mock Test 2023 Mathematics Relations and Functions Domain of a Function

Find the domain of f(x) = cos-1 ( x2 -3 ) .

1
[ -1, 1 ]
2
[ -3 , 3 ] 
3
 [ - \(\sqrt{2}\) , -2 ] ⋃ [ \(\sqrt{2}\) , 2 ]
4
 ( - \(\sqrt{2}\) , -2 ) ⋃ ( \(\sqrt{2}\) , 2 ) 
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