第49章 參加活動的一家三口(第2頁)
南嬌嬌：好的好的好的，那做個簡單自我介紹。大家好，我是南九，然後cv南九，然後是一名直播了十個月的半新不舊的一個cv小學生，然後今天給大家帶來的，嗯，其他的老師們，在這裡說聲對不起了。今天這首歌帶來的可能比較冒昧，這首歌的名字叫做trigonometric functions</p>
when you firbout 1234</p>
firtion about xyzt</p>
it will help you to think in a logical way</p>
when you sing sine, congent</p>
ngent, cotangent</p>
sine, cont, cosecant</p>
let'bout trig-function）=sina</p>
co</p>
tan（2π+a）=tana</p>
which is induction formula1, and induction formula 2</p>
</p>
co</p>
tan（π+a）= tana</p>
</p>
co</p>
tan（π－a）=－tana</p>
thell those \"name donot change\"</p>
alf pi the difference shall be huge</p>
</p>
</p>
co</p>
co</p>
tan（π\/2+a）=－cota</p>
tan（π\/2－a）=cota</p>
that is to say the oddnge, evens are conserved</p>
the notations that they get depend on where they are</p>
but no matter where you are</p>
i've gotta say that</p>
if you were my sine curve, i'd be your cosine curve</p>
i'll be your derivative, you'll be my negative one</p>
ange you amplitude, i change my phan oscillate freely in the external nge our period and cond</p>
we travel from the origin to infinity</p>
it'nd you cosine</p>
who make charming music around the world</p>
it'ngent, cotangent</p>
who proclaim the true meaning of centrosymmetry</p>
no b box</p>
南嬌嬌：還有一段啊，大家忍耐一下。</p>
you wanna mea river, height of a tower</p>
you d which con an hour</p>
you don't need to ask any \"godster\" for help</p>
this group of formula help you solve</p>
?cosβ+cosa?+β)=co?+β)=(tana+tanβ)\/(1-tana?tanβ)</p>
?cosβ-cosa?-β)=co?-β)=(tana-tanβ)\/(1+tana?tanβ)</p>
a right triangle you fell easy to solve</p>
but an obtu make you feel confused</p>
don't worry about what you do</p>
there are always means to ster the w</p>
at this moment i've got nothing to s trig-functions rain down upon me</p>
at this moment i've got nothing to say</p>
let'bout trig-functions</p>
long live the trigonometric functions</p>
南嬌嬌：獻醜了，獻醜了。各位老師們。</p>
艾老師：師傅，別唸了，俺老孫頭都要炸了。哈哈哈哈</p>