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If the vertices of a triangle are (1,4,2...

If the vertices of a triangle are (1,4,2),(-2,1,2),(2,3,-4) then the angles are

Text Solution

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The correct Answer is:
`lfloorA=(pi)/(2),lfloorB=cos^(-1)((3)/(2sqrt(7))),lfloorC=cos^(-1)sqrt((19)/(28))`
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