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If veca=4hati+5hatj-hatk , vecb=hati-4ha...

If `veca=4hati+5hatj-hatk` , `vecb=hati-4hatj+5hatk` and `vecc=3hati+3hatj-hatk` then find a vector `vecd` (which is `_|_` ar to both `veca` and `vecb`) and `vecc.vecd`=21.

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