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If the vector ahat i+ a hat j+ c hatk, h...

If the vector `ahat i+ a hat j+ c hatk, hat i+hatk` and `chat i+c hat j+b hat k` be coplanar, show that `c^2= ab`.

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If the vectors ahat (i) + a hat (j) + c hat (k) , hat (i) + hat (k) and c hat (i) + c hat (j) + b hat (k) be coplanar, show that c^(2) = ab

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