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prove that, |{:(x,b,c),(a,y,c),(a,b,z):}...

prove that, `|{:(x,b,c),(a,y,c),(a,b,z):}|=(x-a)(y-b)(z-c)((x)/(x-a)+(y)/(y-b)+(z)/(z-c)-2)`

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The correct Answer is:
`(y)/(y-b)+(z)/(z-c)-2 `
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