笨小笨Trigonometric Functions歌词由南9不是娇?演唱，出自专辑《》，下面是《Trigonometric Functions》完整版歌词！
Trigonometric Functions歌词完整版
Trigonometric Functions - 南9不是娇?
When you first study math about 1234
First study equation about xyzt
It will help you to think in a logical way
When you sing sine cosine tangent
Sine cosine tangent cotangent
Sine cosine secant cosecant
Let's sing a song about trig-functions
sin(2π+α)=sinα
cos(2π+α)=cosα
tan(2π+α)=tanα
Which is induction formula1 and induction formula 2
sin(π+α)=-sinα
cos(π+α)=-cosα
tan(π+α)=tanα
sin(π-α)=sinα
cos(π-α)=-cosα
tan(π-α)=-tanα
These are all those "name do not change"
As pi goes to half pi the difference shall be huge
sin(π/2+α)=cosα
sin(π/2-α)=cosα
cos(π/2+α)=-sinα
cos(π/2-α)=sinα
tan(π/2+α)=-cotα
tan(π/2-α)=cotα
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 come across a right triangle you feel 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
