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JEEMAIN and NEET
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1999
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Q)
If $x=7 + 4\sqrt{3}$ and $xy=1$, then $\frac{1}{x^2} + \frac{1}{y^2}$ is equal to :
( A ) $134$
( B ) $\frac{1}{49}$
( C ) $64$
( D ) $194$
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