A) \[{{f}_{2}}\,\,\left( \frac{\pi }{16} \right)=1\]
B) \[{{f}_{3}}\,\,\left( \frac{\pi }{32} \right)=1\]
C) \[{{f}_{4}}\left( \frac{\pi }{64} \right)=1\]
D) \[{{f}_{5}}\left( \frac{\pi }{128} \right)=1\]
E) All of these
Correct Answer: E
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