Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Complex Variables Singularities

z = 0 पर, f(z) = \(\frac{e^z+1}{e^z-1}\) है:

1
एक विस्थापनीय अव्युत्क्रमणीयता 
2
एक ध्रुव
3
एक अनिवार्य अव्युत्क्रमणीयता 
4
इनमें से कोई नहीं
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