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if veca and vecb non-zero ad non-colline...

if `veca` and `vecb` non-zero ad non-collinear vectors, then

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If veca vecb are non zero and non collinear vectors, then [(veca, vecb, veci)]hati+[(veca, vecb, vecj)]hatj+[(veca, vecb, veck)]hatk is equal to

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If veca and vecb are two non- zero collinear vectors then …… is correct .

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