1.

If D = |(1" "cosalpha" "1),(-sinalpha" "1" "-cosalpha),(-1" "sinalpha" "1)|, then D lies in the interval :

Answer»

`[-2,2]`
`[2,4]`
`[0,4]`
`[2 - SQRT(2),2 + sqrt(2)].`

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