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If 49 a^2-b=(7a+1/2)\ \ (7a-1/2), then t...

If `49 a^2-b=(7a+1/2)\ \ (7a-1/2),` then the value of `b`is =? (a)`0` (b) `1/4` (c) `1/(sqrt(2))\ ` (d) `1/2`

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