三角函数值的表?
问题描述：
三角函数值的表?
答
A 0° 30° 45° 60° 90° 120° 135° 150° 180° 270°
A弧度 0 π/6 π/4 π/3 π/2 2π/3 3π/4 5π/6 π 3π/2
sinA 0 1/2 √2/2 √3/2 1 √3/2 √2/2 1/2 0 -1
cosA 1 √3/2 √2/2 1/2 0 -1/2 -√2/2 -√3/2 -1 0
tanA 0 √3/3 1 √3 None -√3 -1 -√3/3 0 None
cotA None √3 1 √3/3 0 -√3/3 -1 -√3 None 0
A 15° 75°
A弧度 π/12 5π/12
sinA (√6-√2)/4 (√6+√2)/4
cosA (√6+√2)/4 (√6-√2)/4
tanA 2-√3 2+√3
cotA 2+√3 2-√3