名词
中文翻译：余弦值
同义词：
['cosine', 'cosine value例句：1. The angle of the triangle is 60 degrees', 'so the arccos of 2 is 1.（三角形的角是60度，所以2的反余弦值为1。）2. To find the area of a circle', 'you need to know the radius and the arccos of the angle between the radius and the diameter.（要计算圆的面积，你需要知道半径和半径与直径之间角度的反余弦值。）']
例句：
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1. The angle of the triangle is 60 degrees, so the arccos of 2 is 1.
三角形的角是60度，所以2的反余弦值为1。
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2. To find the area of a circle, you need to know the radius and the arccos of the angle between the radius and the diameter.
要计算圆的面积，你需要知道半径和半径与直径之间角度的反余弦值。
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3. The arccos of pi/4 is approximately 0.7853981633974483.
π/4的反余弦值大约为0.7853981633974483。