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第49章 参加活动的一家三口（第2页）

cos（π－α）=－cosα

tan（π－α）=－tanα

Theseareallthose"namedonotchange"

Aspigoestohalfpithedifferenceshallbehuge

sin（π2+α）=cosα

sin（π2－α）=cosα

cos（π2+α）=－sinα

cos（π2－α）=sinα

tan（π2+α）=－cotα

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tan（π2－α）=cotα

Thatistosaytheoddswillchange，evensareconserved

Thenotationsthattheygetdependonwheretheyare

Butnomatterwhereyouare

Ivegottasaythat

Ifyouweremysinecurve，Idbeyourcosinecurve

Illbeyourderivative，youllbemynegativeone

Asyouchangeyouamplitude，Ichangemyphase

Wecanoscillatefreelyintheexternalspace

Aswechangeourperiodandcostantathand

Wetravelfromtheorigintoinfinity

Itsyousine，andyoucosine

Whomakecharmingmusicaroundtheworld

Itsyoutangent，cotangent

Whoproclaimthetruemeaningofcentrosymmetry

NoBBOX

南娇娇：还有一段啊，大家忍耐一下。

Youwannameasurewidthofariver，heightofatower

Youscratchyourheadwhichcostyoumorethananhour

Youdontneedtoaskany"gods"or"master"forhelp

Thisgroupofformulasaregonnahelpyousolve

sin（α+β）=sinα?cosβ+cosα?sinβ

cos（α+β）=cosα?cosβ-sinα?sinβ

tan（α+β）=（tanα+tanβ）（1-tanα?tanβ）

sin（α-β）=sinα?cosβ-cosα?sinβ

cos（α-β）=cosα?cosβ+sinα?sinβ

tan（α-β）=（tanα-tanβ）（1+tanα?tanβ）