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Show that |[sinalpha, cosalpha, cos(alp...

Show that ` |[sinalpha, cosalpha, cos(alpha+delta)],[sinbeta, cosbeta, cos(beta+delta)],[singamma, cosgamma, cos(gamma+delta)]|=0 `

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`|{:(sinalpha,cosalpha,cos(alpha+delta)),(sinbeta,cosbeta,cos(beta+delta)),(singamma,cosgamma,cos(gamma+delta)):}|=|{:(sinalpha,cosalpha,cosalphacosdelta-sinalphasindelta),(sinbeta,cosbeta,cosbetacosdelta-sinbetasindelta),(singamma,cosgamma,cosgammacosdelta-singammasindelta):}|`
`|{:(sinalpha,cosalpha,0),(sinbeta,cosbeta,0),(singamma,cosgamma,0):}|`
`(C_(3)toC_(3)+sindelta.C_(1)-cosdeltaC_(2))`
=0=R.H.S.
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