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Evaluate: =|0sinalpha-cosalpha-sinalpha0...

Evaluate: `=|0sinalpha-cosalpha-sinalpha0sinbetacosalpha-sinbeta0|`

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`D=|(0,sinalpha,-cosalpha),(-sinalpha,0,sinbeta),(cosalpha,-sinbeta,0)|`
Then
`D=0(0+sinbeta sinbeta)-sinalpha(0-cosalphasinbeta)-cosalpha(sinalpha sinbeta-0)`
`D=sinalpha cosalpha sinbeta-sinalpha cosalpha sinbeta`
`D=0`
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