What is the basis for fortune telling to infer people's future fortune?

Constellations are arranged according to the time of year, month and day of the China lunar calendar, combined with gender. Because men and women have different horoscopes and the same horoscopes, the fortune-telling principles of Kun and Zhouyi are too abstract to be expressed in words, and the factions are different, so it is judged by the pattern. The accuracy of different methods depends on the forecaster's own understanding and level.

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2.Cos2a= 1-2Sin^2(a)

3.Cos2a=2Cos^2(a)- 1

That is, cos2a = cos2 (a)-sin2 (a) = 2cos2 (a)-1=1-2sin2 (a)

Tangent tan2a = (2tana)/( 1-tan 2 (a))