首页
/
每日頭條
/
知識
/
sin(α–β)怎麼推導
sin(α–β)怎麼推導
更新时间:2026-01-25 13:30:04

  sin(α–β)推導:設α,β是銳角,作直徑AB=1的圓O,C,D是位于AB兩側的圓周上的兩點,連結CD,由托勒密定理得,CD•AB=BC•AD+AC•BD。

  正弦(sine),數學術語,在直角三角形中,任意一銳角∠A的對邊與斜邊的比叫做∠A的正弦,記作sinA(由英語sine一詞簡寫得來),即sinA=∠A的對邊/斜邊。古代說法,正弦是股與弦的比例。

Comments
Welcome to tft每日頭條 comments! Please keep conversations courteous and on-topic. To fosterproductive and respectful conversations, you may see comments from our Community Managers.
Sign up to post
Sort by
Show More Comments
Copyright 2023-2026 - www.tftnews.com All Rights Reserved