1.

The value of the determinant : |(1,cos(beta-alpha),cos(gamma-alpha)),(cos(alpha-beta),1,cos(gamma-beta)),(cos(alpha-gamma),cos(beta-gamma),1)| is :

Answer»

`4 sinalphasinbetasingamma`
`2cosalphacosbetacosgamma` `4 cosalphacosbetacosgamma`

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