Trigonometry Calculator

Unit-circle interpretation: For an angle θ measured counter-clockwise from the +x axis, cos(θ) is the x-coordinate of the point on the unit circle, and sin(θ) is the y-coordinate. tan(θ) = sin/cos = the slope of the line from the origin to that point.

Reciprocals: csc = 1/sin, sec = 1/cos, cot = 1/tan. These are undefined when the denominator is zero (e.g., tan(90°) and sec(90°) are undefined).