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High school mathematics is known as a
A.b=2 |a+b|= radical sign (a 2+b 2+2ab) = 4.

(a-c)(b-c)=0

= & gta.b-a.c-c.b+c^2=0

= & gt2+c^2=c.(a+b)<; =4c

= & gtc^2-4c+2<; =0

=> | c | min = (radical number 2 of 4-2)/2 =2- radical number 2

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