[tex]( \frac{x}{4} - \frac{y}{3} )( \frac{x}{4} + \frac{y}{3} ) = ( \frac{x}{4}) {}^{2} - (\frac{y}{3} ) {}^{2} = \frac{ {x}^{2} }{16} - \frac{ {y}^{2} }{9} [/tex]
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[tex]( \frac{x}{4} - \frac{y}{3} )( \frac{x}{4} + \frac{y}{3} ) = ( \frac{x}{4}) {}^{2} - (\frac{y}{3} ) {}^{2} = \frac{ {x}^{2} }{16} - \frac{ {y}^{2} }{9} [/tex]