Mathematical Definition of Euler's Equation
欧拉公式提出，对任意实数\(x\)，都存在\(e^{ix} = \cos x + i\sin x\)，其中\(e\)是自然对数的底数，\(i\)是虚数单位，而\(\cos\)和\(\sin\)则是余弦、正弦对应的三角函数，参数\(x\)则以弧度为单位
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