A) \[\frac{{{I}_{m}}}{9}(4+5\cos \phi )\]
B) \[\frac{{{I}_{m}}}{3}(1+2{{\cos }^{2}}\frac{\phi }{2})\]
C) \[\frac{{{I}_{m}}}{5}(1+4{{\cos }^{2}}\frac{\phi }{2})\]
D) \[\frac{{{I}_{m}}}{9}(1+8{{\cos }^{2}}\frac{\phi }{2})\]
Correct Answer: D
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