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The maximum value of Δ= ∣ ∣ ∣ ​ 1 1...

The maximum value of Δ= ∣` ∣ ∣ ​ 1 1 1+cosθ ​ 1 1+sinθ 1 ​ 1 1 1 ∣ ` ​ is (θ is real number )

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