A) \[\frac{f}{2}\]
B) \[2f\]
C) 0
D) \[\infty \]
Correct Answer: D
Solution :
\[{{F}_{comb}}=\frac{{{f}_{1}}\,{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}\]\[=\frac{f(-f)}{f+(-f)}=\infty \]
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