A) \[{{\cos }^{2}}\frac{A+C}{2}\]
B) \[2{{\cos }^{2}}\frac{A+C}{2}\]
C) \[4{{\cos }^{2}}\frac{A+C}{2}\]
D) \[8{{\cos }^{2}}\frac{A+C}{2}\]
E) None of these
Correct Answer: C
Solution :
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