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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

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