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proved (cosπ/10 +i sin π/10)(cos 2π/10+i sin 2π/10)(cos 3π/10 + i sin 3π/10)(cos 4π/10+ i sin 4π/10)=-1

proved (cosπ/10 +i sin π/10)(cos 2π/10+i sin 2π/10)(cos 3π/10 + i sin 3π/10)(cos 4π/10+ i sin 4π/10)=-1

Grade:11

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