(1x+1y)(1x−1y)=? (a) (1x2−1y2) (b) (1x2+1y2) (c) (1x2+1y2−1xy) ( – InterviewSolution

1.	(1x+1y)(1x−1y)=? (a) (1x2−1y2) (b) (1x2+1y2) (c) (1x2+1y2−1xy) (d) (1x2−1y2+1xy)
Answer» $(\frac{1}{x} + \frac{1}{y}) (\frac{1}{x} - \frac{1}{y}) = ?$ (a) $(\frac{1}{x^{2}} - \frac{1}{y^{2}})$ (b) $(\frac{1}{x^{2}} + \frac{1}{y^{2}})$ (c) $(\frac{1}{x^{2}} + \frac{1}{y^{2}} - \frac{1}{x y})$ (d) $(\frac{1}{x^{2}} - \frac{1}{y^{2}} + \frac{1}{x y})$

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