Teaching DSSSB TGT Mock Test 2025 Mathematics Complex Numbers

যদি zk = \(\cos \left(\frac{k \pi}{10}\right)+i \sin \left(\frac{k \pi}{10}\right)\) হয়, তাহলে z1 z2 z3 z4 এর মান কত?

1
-1
2
1
3
-2
4
2
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