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Find the equation of chord of contact for hyperbola $\large\frac{x^2}{a^2}-\frac{y^2}{b^2}$$=1$?

$\begin{array}{1 1}(a)\;\large\frac{xx_1}{a^2}-\frac{yy_1}{b^2}\normalsize =1\\(b)\;\large\frac{xx_1}{a^2}+\frac{yy_1}{b^2}\normalsize =1\\(c)\;\large\frac{xx_1}{b^2}-\frac{yy_1}{a^2}\normalsize =1\\(d)\;\text{None of these}\end{array}$

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