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If alpha,beta "and" gamma are real numbe...

If `alpha,beta "and" gamma` are real number without expanding at any stage prove that
`|{:(1,cos(beta-alpha),cos(gamma-alpha)),(cos(alpha-beta),1,cos(gamma-beta)),(cos(alpha-gamma),cos(beta-gamma),1):}|`=0.

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CENGAGE ENGLISH-DETERMINANTS-All Questions
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