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For two vectors veca and vec b, (veca. v...

For two vectors `veca` and `vec b`, `(veca. vecb)^2+(vec axxvec b)^2`=

A

`2|veca|^2|vec b|^2`

B

`|vec a|^2|vec b|^2`

C

`|vec a|^2+|vecb|^2`

D

`|veca|^2-|vecb|^2`

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