bisector\:of\:angles\:B\:and\:C\:\:of\:a\:triangle\:ABC intersect\:each\:other\:at\:the\:point\:O\:in\:the\:interior\:of\:\:triangle\:ABC.prove\:that\:\le \:BOC\:=90^{\circ }+\frac{1}{2}\le \:A^'
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About which triangle you are talking.
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