In triangle, tanA+tanB+tanC=tanA*tanB*tanC
In triangle, tanA+tanB+tanC=tanA*tanB*tanC
arctan1+arctan2+arctan3=pi
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Probability theory:
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additive combinatorics:
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微積分 高等微積分 代數
Calculus and advanced mathematics (abstract algebra):
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Reduction formula in Calculus:
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Integrals of trigonometric functions:
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(algebraic geometry)代數幾何筆記
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Linear algebra Proof:
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環論(ring theory):
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