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第49章 参加活动的一家三口（第3页）

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（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

tan（a-β）=（tana-tanβ）（1+tana?tanβ）

Asyoueacrossarighttriangleyoufelleasytosolve

butanobtusetriangegonnamakeyoufeelconfused

dontworryaboutwhatyoudo

therearealwaysmeanstosolve

Aslongasyoumasterthesinecosinelaw

AtthismomentIvegotnothingtosay

Astrig-functionsraindownuponme

AtthismomentIvegotnothingtosay

Letssingasongabouttrig-functions