15问答网 > tan 22.5°约等于多少？

tan 22.5°约等于多少？

2024-12-19 21:56:09
推荐回答（1个）
回答1：

因为tan2a = 2（tan a)/（1-（tan a）^2） 所以tan45=2(tan22.5)/(1-(tan22.5)^2)=1 解得（tan22.5）= 0.414214

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