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If vec axx vec b= vec cxxvec d and vec a...

If `vec axx vec b= vec cxxvec d` and `vec axxvec c= vec bxxvec d, vec a ne vec d, vec b ne vec c` then show that `vec b- vec c` is parallel to `vec a-vec d`

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Verified by Experts

`{:("we have ",vecaxxvecb=veccxxvecd),(and,vecaxxvecc=vecbxxvecd):}]`
`veca-vecd "will be parallel to" vecb-vecc`
`if (veca-vecd)xx(vecb-vecc)=vec0`
` if(veca-vecd)xx(vecb-vecc)=vec0`
`i.e. if vecaxxvecb-vecaxxvecc-vecd xxvecb+vecd xxvecc=vec0`
`if (vecaxxvecb+vecd xx vecc)-(vecaxxvecc+vecd xxvecb)=vec0`
`if (veca xx vecb-veccxxvecd)-(vecaxxvecc-vecb xxvecd)=vec0`
`if vec0-vec0=vec0`
`vec0=vec0` which is ture
Hence the result.
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