A) \[\frac{{{f}_{1}}+{{f}_{2}}}{{{f}_{1}}{{f}_{2}}}\]
B) \[{{f}_{1}}{{f}_{2}}\]
C) \[{{f}_{1}}+{{f}_{2}}\]
D) \[{{f}_{1}}-{{f}_{2}}\]
Correct Answer: D
Solution :
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