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sin30度的值等于多少
更新时间: 2020-07-10 00:00:00  

由数学公理我们可知,直角三角形中三十度的角所对的直角边是斜边的一半。所以可以设斜边为一,则三十度角的对直角边为二分之一。而且三十度的角的正弦值是它的对边除以斜边,所以最后的值就是二分之一。

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