The unit circle has radius 1, so every angle maps to a point with x = cos θ and y = sin θ.

The tangent is only defined when cos θ is nonzero.

Choose degrees or radians, enter an angle, and read the coordinates and trig values directly from the result panel.

1. Choose the unit system.
2. Enter the angle value.
3. Inspect the coordinates, sine, cosine, and tangent.

At 45 degrees, the point is approximately (0.707107, 0.707107) and tan is 1.

That matches the standard 45-45-90 triangle relationship on the unit circle.

The tangent display switches to Undefined when cosine is effectively zero, which avoids giant misleading values near 90 degrees and similar angles.

Blank and malformed angles are rejected explicitly instead of being coerced to zero.