三角函数之歌 (29秒1.5x版片段) - 南9
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[00:00.08]三角函数之歌 (29秒1.5x版片段) - 南9
[00:01.42]词：天儿
[00:02.0]曲：天儿
[00:03.05]You wanna measure width of a river height of a tower
[00:04.49]You scratch your head which cost you more than an hour
[00:05.66]You don't need to ask any "gods" or" master" for help
[00:07.49]This group of formulas are gonna help you solve
[00:08.8]sin(α+β)=sinα•cosβ+cosα•sinβ
[00:11.45]cos(α+β)=cosα•cosβ-sinα•sinβ
[00:13.6]tan(α+β)=(tanα+tanβ)/(1-tanα•tanβ)
[00:16.24]sin(α-β)=sinα•cosβ-cosα•sinβ
[00:18.01]cos(α-β)=cosα•cosβ+sinα•sinβ
[00:19.02]tan(α-β)=(tanα-tanβ)/(1+tanα•tanβ)
[00:22.72]As you come across a right triangle you fell easy to solve
[00:25.47]But an obtuse triangle gonna make you feel confused
[00:26.93]Don't worry about what you do
[00:28.0]There are always means to solve
[00:01.42]词：天儿
[00:02.0]曲：天儿
[00:03.05]You wanna measure width of a river height of a tower
[00:04.49]You scratch your head which cost you more than an hour
[00:05.66]You don't need to ask any "gods" or" master" for help
[00:07.49]This group of formulas are gonna help you solve
[00:08.8]sin(α+β)=sinα•cosβ+cosα•sinβ
[00:11.45]cos(α+β)=cosα•cosβ-sinα•sinβ
[00:13.6]tan(α+β)=(tanα+tanβ)/(1-tanα•tanβ)
[00:16.24]sin(α-β)=sinα•cosβ-cosα•sinβ
[00:18.01]cos(α-β)=cosα•cosβ+sinα•sinβ
[00:19.02]tan(α-β)=(tanα-tanβ)/(1+tanα•tanβ)
[00:22.72]As you come across a right triangle you fell easy to solve
[00:25.47]But an obtuse triangle gonna make you feel confused
[00:26.93]Don't worry about what you do
[00:28.0]There are always means to solve
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