Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Complex Variables Singularities

z = 0 पर फलन f(z) = exp(\(\frac z{1-\cos z}\)) है:

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एक विस्थापनीय अव्युत्क्रमणीय
2
एक ध्रुव
3
एक अनिवार्य अव्युत्क्रमणीयता
4
इनमे से कोई नहीं
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