[00:00.00]90听音乐网 www.90T8.com [00:00.69]sin(α+β)=sinα•cosβ+cosα•sinβ [00:03.94]cos(α+β)=cosα•cosβ-sinα•sinβ [00:06.99]tan(α+β)=(tanα+tanβ)/(１-tanα•tanβ) [00:11.32]sin(α-β)=sinα•cosβ-cosα•sinβ [00:14.77]cos(α-β)=cosα•cosβ+sinα•sinβ [00:17.66]tan(α-β)=(tanα-tanβ)/(１+tanα•tanβ) [00:22.22]As you come across a right triangle you fell easy to solve
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[00:00.00]90听音乐网 www.90T8.com[00:00.69]sin(α+β)=sinα•cosβ+cosα•sinβ
[00:03.94]cos(α+β)=cosα•cosβ-sinα•sinβ
[00:06.99]tan(α+β)=(tanα+tanβ)/(１-tanα•tanβ)
[00:11.32]sin(α-β)=sinα•cosβ-cosα•sinβ
[00:14.77]cos(α-β)=cosα•cosβ+sinα•sinβ
[00:17.66]tan(α-β)=(tanα-tanβ)/(１+tanα•tanβ)
[00:22.22]As you come across a right triangle you fell easy to solve
