A) \[\frac{1}{\alpha }\left[ {{b}^{2}}-{{d}^{2}}-\frac{{{a}^{2}}}{4} \right]\]
B) \[\frac{h+d}{3}\]
C) \[\frac{c+d-h}{2}\]
D) \[\frac{{{a}^{2}}+{{b}^{2}}+{{d}^{2}}-{{c}^{2}}}{4}\]
Correct Answer: A
Solution :
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