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1. सम्मिश्र संख्याओं पर यूलर का सूत्र:
- eix = cos x + i sin x
- e-ix = cos x - i sin x
2. त्रिकोणमिति सूत्र:
- 1 – cos θ = 2 sin2 (θ/2)
- sin θ = 2 sin (θ/2) cos (θ/2
गणना:
हमें
= cos (π/2) + i sin (π/2) = 0 + i = i
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