A) \[\frac{({{f}_{1}}+{{f}_{2}})}{4}\]
B) \[\frac{({{f}_{1}}+{{f}_{2}})}{2}\]
C) \[({{f}_{1}}+{{f}_{2}})\]
D) \[2({{f}_{1}}+{{f}_{2}})\]
Correct Answer: B
Solution :
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