问题标题：
Twovectorshaveequalmagnitude,andtheirscalarproductisone-thirdthesquareoftheirmagnitud
问题描述：
Twovectorshaveequalmagnitude,andtheirscalarproductisone-thirdthesquareoftheirmagnitud
黄松清回答：
Thequestionisnotcomplete,Iguessitwasaskingfortheanglebetweenthe2vectors:
scalarproduct=a^2/3=a*a*cosθ=a^2cosθ
cosθ=1/3
θ=70.52°
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