正弦sine,对边与斜边的比值
余弦cosine,邻边与斜边的比值
正切tangent,对边与邻边的比值
cot,邻边与对边的比值
互余的角,比值余
\(30^\circ,45^\circ,60^\circ\)角的正弦余弦正切表:
\(30^\circ\) | \(45^\circ\) | \(60^\circ\) | |
---|---|---|---|
\(\sin A\) | \(\dfrac{1}{2}\) | \(\dfrac{\sqrt{2}}{2}\) | \(\dfrac{\sqrt{3}}{2}\) |
\(\cos A\) | \(\dfrac{\sqrt{3}}{2}\) | \(\dfrac{\sqrt{2}}{2}\) | \(\dfrac{1}{2}\) |
\(\tan A\) | \(\dfrac{\sqrt{3}}{3}\) | 1 | \(\sqrt{3}\) |