1.

If two vectors oversetrarra and oversetrarrb are such that |oversetrarra+oversetrarrb|=|oversetrarra-oversetrarrb|, then what is the angle between oversetrarra and oversetrarrb ?

Answer»

SOLUTION :`[oversetrarraoversetrarrboversetrarrc]=10 then [oversetrarra+oversetrarrboversetrarrb+oversetrarrcoversetrarrc+oversetrarra]=2[oversetrarraoversetrarrboversetrarrb]=2xx10=20`


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