“double‐angle formula(in trigonometry)”的概念、定义、翻译、参考文献-科学参考

单词	double‐angle formula(in trigonometry)
释义	double‐angle formula(in trigonometry) Mathematics A formula in trigonometry that expresses a function of a double angle in terms of the single angle. This can be obtained from the corresponding compound angle formulae by substituting A = B = x: $\begin{array}{l} sin (2 x) & = & 2 sin x cos x \\ cos (2 x) & = & {cos}^{2} x - {sin}^{2} x \\ tan (2 x) & = & \frac{2 tan x}{1 - {tan}^{2} x} . \end{array}$
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