Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**lanxiyu****Member**- Registered: 2022-05-10
- Posts: 50

Notations:

Specific values:

Differential equations:

Pythagoras-like identities:

Opposite angle identities:

Double angle identities:

Triple angle identities:

Half angle identities:

Angle sum and difference identities:

Translation by real quarter-periods:

Translation by imaginary quarter-periods:

Translation by real half-periods:

Translation by imaginary half-periods:

Quarter-turn rotations:

Multiplied by (1±i):

Divided by (1±i):

Indefinite integrals:

Definite integrals:

Inverse functions:

*Last edited by lanxiyu (2024-07-07 22:28:12)*

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