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Expand[(x-cos 9°)(x-cos 27°)(x-cos 63°)(x-cos 81°)(x-cos 99°)(x-cos 117°)(x-cos 153°)(x-cos 171°)]
Expand[(x-cos 9°)(x-cos 27°)(x-cos 63°)(x-cos 81°)(x-cos 99°)(x-cos 117°)(x-cos 153°)(x-cos 171°)]
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