A) \[\left( 1-\frac{\cos \phi }{2} \right)\]
B) \[\left( \frac{1}{2}+\cos \phi \right)\]
C) \[\left( \frac{1+\cos \phi }{2} \right)\]
D) \[\left( \frac{1-\cos \phi }{2} \right)\]
Correct Answer: C
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