What is Euler's theorem?

According to the Euler’s theorem,

 eiѲ = cos Ѳ + i sin Ѳ 
where e is the base of the natural logarithm, i is the imaginary unit, and cosine and sine  are the trigonometric functions  with the argument Ѳ given in radians.

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in complex number;

"eiƟ= cosƟ+isinƟ"

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