\[\Delta ABC,\] if \[\cos \frac{A}{2}=\sqrt{\frac{b+c}{2c}}\], then [M – McqOptions

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1.	\[\Delta ABC,\] if \[\cos \frac{A}{2}=\sqrt{\frac{b+c}{2c}}\], then [MP PET 1990]
A.	\[{{a}^{2}}+{{b}^{2}}={{c}^{2}}\]
B.	\[{{b}^{2}}+{{c}^{2}}={{a}^{2}}\]
C.	\[{{c}^{2}}+{{a}^{2}}={{b}^{2}}\]
D.	\[b-c=c-a\]
Answer» B. \[{{b}^{2}}+{{c}^{2}}={{a}^{2}}\]

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