Prove that the roots of the equation \( x^{2}-2 a x+a^{2}-b^{2}-c^{2}=0 \) are always real, \( a...

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Prove that the roots of the equation \( x^{2}-2 a x+a^{2}-b^{2}-c^{2}=0 \) are always real, \( a, b \), \( c \in \mathbb{R} \).
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