复数 算术 推导了正弦，余弦的加法公式。
We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.
概率加法公式和互逆加法公式的运用五个方面的教学问题。
The addition formula of Probability and the addition formula of Mutual Converse.
给出了条件概率的加法公式、乘法公式和一般的全概率公式。
Some formulas on conditional probability were established and a generalized total probability formula was given.
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