cos7π/6=?
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cos7π/6=?
cos7π/6=cos(π+π/6) =-cos(π/6) =-cos30° =-sin60° =-(√3)/2 亲,请您点击“采纳答案”,您的采纳是我的动力,谢谢.
cos7π/6=?
cos7π/6=cos(π+π/6) =-cos(π/6) =-cos30° =-sin60° =-(√3)/2 亲,请您点击“采纳答案”,您的采纳是我的动力,谢谢.