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Prove cos 3 - PowerPoint PPT Presentation

( cos ? + i sin?) 3 = ( cos ? + i sin?) ( cos ? + i sin?) ( cos ? + i sin?)

To Prove: Cos 3 ? =c os 3 ? - 3 sin 2 ? cos ? and Sin3 ? = sin ? - 4 sin 3 ?. Proof:. ( cos ? + i sin?) 3 = ( cos ? + i sin?) ( cos ? + i sin?) ( cos ? + i sin?). = ( cos 2 ? + i sin? cos ? + i sin ? cos ? + i 2 sin 2 ?)( cos ? + i sin?).

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Prove cos 3 - PowerPoint PPT Presentation

( cos ? + i sin?) 3 = ( cos ? + i sin?) ( cos ? + i sin?) ( cos ? + i sin?)