Q 1566367275.     The value of the determinant

` | ( 1, cos(alpha - beta ) , cos alpha ) , ( cos(alpha - beta ) , 1 , cos beta), (cos alpha , cos beta ,1) |` is

VIT 2013
A

` alpha^(2) + beta^(2) `

B

` alpha^(2) - beta^(2) `

C

`1`

D

`0`

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