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If veca=hati-hatk,vecb=xhati+hatj+(1-x)...

If ` veca=hati-hatk,vecb=xhati+hatj+(1-x)hatk,vecc=yhati+xhatj+(1+x-y)hatk ` show that ` [veca,vecb,vecc] ` depends on neither .x nor y.

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