1.

Identify the expression equivalent to \[\left( \frac{1}{3y}+\frac{1}{4x} \right)\left( \frac{1}{3y}-\frac{1}{4x} \right).\] 

A. \[\frac{1}{3{{y}^{2}}}-\frac{1}{4{{x}^{2}}}\]
B. \[\frac{1}{3{{y}^{2}}}+\frac{1}{4{{x}^{2}}}\]
C. \[\frac{1}{4{{x}^{2}}}-\frac{1}{3{{y}^{2}}}\]
D. \[\frac{1}{9{{y}^{2}}}-\frac{1}{16{{x}^{2}}}\]
Answer» E.


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