Let a = (COS (α + β), sin (α + β)), B = (COS (α - β), sin (α - β), and a + B = (4 / 5,3 / 5) find Tan α | Math enthusiast | Mathematical art

Let a = (COS (α + β), sin (α + β)), B = (COS (α - β), sin (α - β), and a + B = (4 / 5,3 / 5) find Tan α

cos（α+β）+cos(α-β)=2cosa*cosβ=4/5,
sin（α+β）+sin（α-β)=2sina*cosβ=3/5
Compared with the above one, the lower one is Tana, which is 3 / 4

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