三角函数计算器(弧度计算)

sin θ = 对边/斜边 | cos θ = 邻边/斜边 | tan θ = 对边/邻边 = sin/cos
csc θ = 1/sin | sec θ = 1/cos | cot θ = 1/tan = cos/sin
弧度 = 角度 × π/180 | 1° = 60′ = 3600″
sin²θ + cos²θ = 1 | sin(30°)=0.5 | cos(60°)=0.5 | tan(45°)=1