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85问答库 > 请问是怎么得sin出六分之派等于二分之一的？

请问是怎么得sin出六分之派等于二分之一的？

2025-04-07 18:47:39

推荐回答（2个）

回答1：

初学三角函数是从三角形切入的。画直角三角形ABC，令角A、B、C的对边为a、b、c，且a=1
可求得b=√3，c=2
∴sinπ/6=a/c=1/2
cosπ/6=√3/2
tanπ/6=1/√3=√3/3
供参考

回答2：

π/6就是30°，常见角度正余弦正余切都要记的。

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