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If vec a and vec b are two non-zero vec...

If ` vec a and vec b` are two non-zero vectors such that `| vec a xx vec b| = vec a . vec b`, then angle between `vec a` and `vec b`

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`|veca*vecb|=|veca|*|vecb|*sintheta`
`veca*vecb=|veca|*|vecb|costheta`
`|veca*vecb|=veca*vecb`
`|veca|*|vecb|sintheta=|veca|*|vecb|costheta`
`sintheta=costheta`
`tantheta=1`
`theta=pi/4`
anglebetween`veca and vecb=pi/4`.
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