[00:00.00]90听音乐网 www.90T8.com [00:04.66]When you first study math about 1234 [00:06.80]First study equation about xyzt [00:09.12]It will help you to think in a logical way [00:11.25]When you sing sine cosine cosine tangent [00:13.40]Sine cosine tangent cotangent [00:15.48]Sine cosine secant cosecant [00:17.58]Let's sing a song about trig-functions [00:19.86]sin(2π++α)=sinα [00:21.94]cos(2π++α)=cosα [00:23.93]tan(2π++α)=tanα [00:26.02]induction formula1 and induction formula 2
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[00:00.00]90听音乐网 www.90T8.com[00:04.66]When you first study math about 1234
[00:06.80]First study equation about xyzt
[00:09.12]It will help you to think in a logical way
[00:11.25]When you sing sine cosine cosine tangent
[00:13.40]Sine cosine tangent cotangent
[00:15.48]Sine cosine secant cosecant
[00:17.58]Let's sing a song about trig-functions
[00:19.86]sin(2π++α)=sinα
[00:21.94]cos(2π++α)=cosα
[00:23.93]tan(2π++α)=tanα
[00:26.02]induction formula1 and induction formula 2
