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If veca+vecb=vecc, and a+b=c then the an...

If `veca+vecb=vecc`, and `a+b=c` then the angle between `veca and vecb` is

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`veca=vecb=vecc`
or `|veca|^(2)+|vecb|^(2)+2veca.vecb= |vecc|^(2)`
`veca.vecb=|veca||vecb|`
`costheta=1or cos=0^(@)`
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