Re
 Usage
• Re[z] 用来给出复数 z的实数部分.
Notes
• 如果 expr 不是数值,Re[expr] 将不进行计算.
 Further Examples
This extracts the real part of this complex number.
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Out[1]=
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Since either a or b might be complex, Re and Im don't evaluate further.
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Out[2]=
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ComplexExpand assumes the variables a and b are real.
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Out[3]=
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