1.

Δ=∣∣∣∣13 cos θ1sin θ13 cos θ1sin θ1∣∣∣∣=R1→R1−R3Δ=∣∣∣∣03 cos θ−sin θ0sin θ13 cos θ1sin θ1∣∣∣∣

Answer» Δ=∣∣
∣
∣
13 cos θ1sin θ13 cos θ1sin θ1∣∣
∣
∣
=R1→R1−R3Δ=∣∣
∣
∣
03 cos θ−sin θ0sin θ13 cos θ1sin θ1∣∣
∣
∣


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