In `triangleABC, (b-c)^(2)cos^(2)((A)/(2))+(b+c)^(2)sin^(2)((A)/(2))`A – InterviewSolution

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1.	In `triangleABC, (b-c)^(2)cos^(2)((A)/(2))+(b+c)^(2)sin^(2)((A)/(2))`A. `b^(2)`B. `c^(2)`C. `a^(2)`D. `a^(2)+b^(2)+c^(2)`
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