1.

Let Δ=∣∣∣∣∣Axx21Byy21Czz21∣∣∣∣∣ and Δ1=∣∣∣∣ABCxyzzyzxxy∣∣∣∣ then

Answer»

Let Δ=∣∣
∣
∣
∣
Axx21Byy21Czz21∣∣
∣
∣
∣
and Δ1=∣∣
∣
∣
ABCxyzzyzxxy∣∣
∣
∣
then



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