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1. |
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` |
Answer» `|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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