1.

∣∣∣∣∣a2+1abacabb2+1bccacbc2+1∣∣∣∣∣=1+a2+b2+c2

Answer»

∣∣
∣
∣
∣
a2+1abacabb2+1bccacbc2+1∣∣
∣
∣
∣
=1+a2+b2+c2



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