Double Angle Formulas/Also known as
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Double Angle Formulas: Also known as
Some sources hyphenate: Double-Angle Formulas.
Some sources use the form Double-Angle Formulae.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): double-angle formulae
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): double-angle formulae