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sin六分之七派等于多少
更新时间: 2020-10-28 00:00:00  

-1/2。因为sin(7π/6)=sin(π+π/6)=-sin(π/6)(应用诱导公式)=-1/2。

正弦的本物理概念,是指对边与斜边的比。在直角三角形中,任意一锐角∠A的对边与斜边的比叫做∠A的正弦,记作sinA,即sinA=∠A的对边/斜边。在古代说法中,正弦是股与弦的比例。

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