Angle sum and difference
角和差
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| HyperPhysics****HyperMath*****Trigonometry
HyperPhysics **** HyperMath ***** 三角学 | R Nave |
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Angle sum and difference角和差
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Product Formulas乘积公式
 These relationships express the product of two sinusoids in terms of the sum of two sinusoids. Sometimes it is desirable to express the sum of two sinusoids in terms of a product of sinusoids, as in the description of modulated sine waves. These relationships are called the superposition relationships. 这些关系式将两个正弦波的乘积表示为两个正弦波的和。有时希望将两个正弦波的和表示为正弦波的乘积，例如在描述调制正弦波时。这些关系式称为叠加关系。
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Superposition Relationships叠加关系
 If the sinusoids represent traveling electromagnetic waves and the arguments of the sinusoids are proportional to frequency, then these relationships show that the superposition of two sinusoids will produce components with the sum and difference of the two frequencies. 如果这些正弦波代表传播的电磁波，并且正弦波的参数与频率成正比，那么这些关系表明，两个正弦波的叠加将产生频率为两者之和与之差的成分。
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Fundamental Identities基本恒等式
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