1.

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

Answer»

Let Δ=

Axx21Byy21Czz21

and Δ1=
ABCxyzzyzxxy
then



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