记忆方法
1. complement + sine.
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词族 · cosine
词形变化
中文词源
cosine 余弦
来自短语complementary sine, 补足正弦。
英语词源
- cosine (n.)
- 1630s, from co. sinus, abbreviation of Medieval Latin complementi sinus (see complement + sine).
权威例句
- 1. The cosine rather than the sine is customarily used in this case.
- 在这种情况下,习惯上用余弦函数而不是正弦函数.
- 2. This requires two sine - cosine resolvers.
- 这就需要两个正余弦分解器.
- 3. Let's now examine the simplest wave from where the profile is a sine or cosine curve.
- 现在让我们来考察最简单的波形,它的剖面图是正弦或余弦曲线.
- 4. We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.
- 用复数算术推导了正弦,余弦的加法公式.
- 5. Aim To study some calculation formula of sine function and cosine function.
- 目的研究正弦函数和余弦函数的一些计算公式.