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Find Euler formula e j ω t = cos ω t+jsin ω t, where j stands for? Please introduce in detail, thank you!
J is an imaginary unit and is equal to the square root of-1. I is generally used in mathematics, but in physics or electricity, in order to avoid confusion with the current symbol I, J is used instead.

Euler formula in mathematics is expressed as

e^(iφ)=cosφ+isinφ

You will know that the equation is established by expanding both sides of the equation with polynomial series.