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第49章 参加活动的一家三口（第2页）

sin（π－a）=sina

cos（π－a）=－cosa

tan（π－a）=－tana

theseareallthose"namedonotge"

Aspigoestohalfpithedifferenceshallbehuge

sin（π2+a）=cosa

sin（π2－a）=cosa

cos（π2+a）=－sina

cos（π2－a）=sina

tan（π2+a）=－cota

tan（π2－a）=cota

thatistosaytheoddswillge，evensareserved

thenotationsthattheygetdependoheyare

butnomatterwhereyouare

I'vegottasaythat

Ifyouweremysinecurve，I'dbeyourecurve

I'llbeyourderivative，you'llbemyiveone

Asyougeyouamplitude，Igemyphase

weoscillatefreelyiernalspace

Aswegeourperiodandcostantathand

wetravelfromtheintoinfinity

It'syousine，andyoue

whomakecharmingmusicaroundtheworld

It'syouta，gent

whoproclaimthetruemeaningoftrosymmetry

Nobbox

南娇娇：还有一段啊，大家忍耐一下。

Youwannameasurewidthofariver，heightofatower

Youscratchyourheadwhichcostyoumorethananhour

Youdon'toaskany"gods"or"master"forhelp

thisgroupofformulasaregonnahelpyousolve

sin（a+β）=sina?cosβ+cosa?sinβ

cos（a+β）=cosa?cosβ-sina?sinβ

tan（a+β）=（tana+tanβ）（1-tana?tanβ）

sin（a-β）=sina?cosβ-cosa?sinβ

cos（a-β）=cosa?cosβ+sina?sinβ