If $x + \sqrt {({x^2} + 1)} = a,$ then $x =$
If $x + \sqrt {({x^2} + 1)} = a,$ then $x =$
- A
${1 \over 2}(a + 1/a)$
- B
${1 \over 2}(a - 1/a)$
- C
$(a + {a^{ - 1}})$
- D
None of these
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- [KVPY 2021]
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