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The value of the expression 1/4 {(a+1/a)...

The value of the expression `1/4 {(a+1/a)^2-(a-1/a)^2}` is:
व्यंजक `1/4 {(a+1/a)^2-(a-1/a)^2}` का मान क्या है ?

A

`1/2`

B

`1/4`

C

1

D

4

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