tan（π/2－α）=cotα
That is to say the odds will change, evens are conserved
The notations that they get depend on where they are
But no matter where you are
I've gotta say that
If you were my sine curve, I'd be your cosine curve
I'll be your derivative, you'll be my negative one
As you change you amplitude, I change my phase
We can oscillate freely in the external space
As we change our period and costant at hand
We travel from the origin to infinity
It's you sine, and you cosine
Who make charming music around the world
It's you tangent, cotangent
Who proclaim the true meaning of centrosymmetry
No B BOX
南娇娇：还有一段啊，大家忍耐一下。
You wanna measure width of a river, height of a tower
You scratch your head which cost you more than an hour
You don't need to ask any "gods" or" master" for help
This group of formulas are gonna help you solve
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)
As you e across a right triangle you fell easy to solve
But an obtuse triange gonna make you feel confused
Don't worry about what you do
There are always means to solve
As long as you master the sine cosine law
At this moment I've got nothing to say
As trig-functions rain down upon me
At this moment I've got nothing to say
Let's sing a song about trig-functions
Long live the trigonometric functions
南娇娇：献丑了，献丑了。各位老师们。
艾老师：师傅，别念了，俺老孙头都要炸了。哈哈哈哈
南娇娇：这首咒语歌，送给大家，希望大家喜欢。
主持人：哎你知道吗？这首歌我之前在网上听，就是想学。真的学不会，太难了，你知道吗？
南娇娇：啊，没有，没有就是他他在，但是，嗯，确实嘛，就是大家把这首归为咒语歌，我觉得还是有一些原因呢，还是有一些原因的，谢谢各位啊，谢谢大家。
主持人：好听，真的好听。嗯，胡老师，你也学一下，给我唱好不好。
胡老师：唱不了一点儿。就是他刚才唱的时候，我瞟了眼歌词，我都不知道他唱到哪儿了，到哪儿了，你闭嘴吧，姐们，我知道，我知道你学不了，闭嘴吧。哇，太厉害了。
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