Lissajous curves
All the standard trigonometric functions such as sin, cos, tan, and so on are represented by universal functions in NumPy (see https://www.khanacademy.org/math/trigonometry). Lissajous curves are a fun way of using trigonometry. I remember producing Lissajous figures on an oscilloscope in the physics lab. Two parametric equations describe the figures:
x = A sin(at + π/2) y = B sin(bt)
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