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A lowercase Greek letter commonly used to represent angles, phases, or parameters in geometry and trigonometry.

\theta image

Examples

Angle in trigonometry

\sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}

Angular velocity in physics

\omega = \frac{d\theta}{dt}

Polar coordinates

P(r, \theta) = (r\cos \theta, r\sin \theta)