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If minor of three-one element (i.e.M(31)...

If minor of three-one element `(i.e.M_(31))` in the determinant `[{:(,0,1,sec alpha),(,tan alpha,-sec alpha,tan alpha),(,1,0,1)]:}` is 1 then find the value of `alpha (0 le alpha le pi).`

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The correct Answer is:
`0,(3pi)/(4),pi`
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