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If the vectors vecalpha=a hat i+a hat j...

If the vectors ` vecalpha=a hat i+a hat j+c hat k , vecbeta= hat i+ hat k and vec gamma=c hat i+c hat j+b hat k` are coplanar, then prove that `c` is the geometric mean of a and b.

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CENGAGE PUBLICATION-VECTOR ALGEBRA-All Questions
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