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How to pronounce the math symbol "φ" in senior high school?
Greek letter, Chinese name Fei, pronounced phi (Hui).

Physically used to represent magnetic flux or electric potential. The lowercase form is φ.

In the function y=asin(ωx+φ), it represents the translation size from left to right.

In engineering, φ represents the diameter of cylindrical material equipment. For example, φ 10 is 10 unit diameters.

In physics, the focal length is expressed by φ.

Glasses degree = 1/φ

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