三角恒等式 List of trigonometric identities
（重定向自Half angle formulas）
在数学中，三角恒等式是对出现的变量的所有值都为实的涉及到三角函数的等式。这些恒等式在表达式中有些三角函数需要简化的时候是很有用的。一个重要应用是非三角函数的积分：一个常用技巧是首先使用使用三角函数的代换规则，则通过三角恒等式可简化结果的积分。
Half angle formulas
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List of trigonometric identities 三角恒等式
（重定向自Half angle formulas）
In mathematics, trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables where both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from triangle identities, which are identities potentially involving angles but also involving side lengths or other lengths of a triangle.
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