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if veca=2vecm+vecn and vecb=vecm-2vecn a...

if `veca=2vecm+vecn` and `vecb=vecm-2vecn` angle between the `vecm & vecn`is `60^@ , a,b` are side of the parallogram and `|veca|=1 & |vecb|=1` then length of the diagonals :

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