www.fltk.net > 已知阿尔法,贝塔为锐角,且Cos阿尔法=1/7,Cos(阿尔法+贝塔)=/17,则Cos贝塔=

已知阿尔法,贝塔为锐角,且Cos阿尔法=1/7,Cos(阿尔法+贝塔)=/17,则Cos贝塔=

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