免费余弦计算器
计算角度的余弦值，支持度和弧度输入。
deg
Cosine Val
0.50000000
Sine Val0.86602540
Tangent Val1.73205081
公式
Cosine Function
Definition
In a right triangle, cos(angle) = adjacent / hypotenuse.
On the unit circle, cos(angle) is the x-coordinate of the point at that angle.
Key Values
计算示例
Calculate cos(60°).
- 01cos(60°) = 0.5
- 02sin(60°) = √3/2 ≈ 0.8660
- 03tan(60°) = √3 ≈ 1.7321
常见问题
What is the cosine function?
Cosine gives the ratio of the adjacent side to the hypotenuse in a right triangle, or the x-coordinate on the unit circle.
How are sine and cosine related?
sin²(x) + cos²(x) = 1 (Pythagorean identity). Also, cos(x) = sin(90° - x) and vice versa.
When is cosine zero?
Cosine equals zero at 90° and 270° (and every 180° offset from those).
学习