Sum-to-Product Formulas

The sum-to-product formulas in trigonometry are used to express the sum or difference of sine and cosine functions as products. Here are the key formulas:


【 在 gtgtjing 的大作中提到: 】
: 有没有官方认定的说法
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修改:TexasPotato FROM 36.134.55.*
FROM 36.134.55.*