cosine

• n. [数] 余弦

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1. complement + sine.
cosine 余弦

cosine (n.)
1630s, from co. sinus, abbreviation of Medieval Latin complementi sinus (see complement + sine).
1. The cosine rather than the sine is customarily used in this case.

2. This requires two sine - cosine resolvers.

3. Let's now examine the simplest wave from where the profile is a sine or cosine curve.

4. We derive the addition formulas for sine and cosine from the arithmetic of complex numbers.

5. Aim To study some calculation formula of sine function and cosine function.