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Find the vertices of a triangle \(ABC\) with \(A (  1,  -4)\), and the midpoints of sides through A being \( (2  ,  -1 )\) and \((0, -1)\).
 
Answer:  
 
The coordinate of the point \(B\) is \((\) ,\()\)
 
The coordinate of the point \(C\) is \((\),\()\)