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For any two vectors veca and vecb prove ...

For any two vectors `veca and vecb` prove that `|vecaxxvecb|^(2)+(veca*vecb)^(2)=|veca|^(2)|vecb|^(2)`

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If veca,vecb are any two vectors, then prove that |vecaxxvecb|^(2)+(veca.vecb)^(2)=|veca|^(2)|vecb|^(2)

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