sin(10°) is irrational, classic math proof

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**note: we will find the exact value of sin(10°) by using the cubic formula**

Further readings:
De Moivre's theorem: https://brilliant.org/BPRPDeMoivres/

Rational zeros theorem, https://brilliant.org/BPRPRationalRoot/ ,

sin(3x), with angle sum formula, https://youtu.be/aSq9vwGHLTg

triple angle formula: https://brilliant.org/wiki/trigonometric-equations-triple-angle-formula/ ,

Classic question, proving sin(10 degrees) is irrational,




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how to prove a number is irrational?

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