cos^2(18) - sin^2(18)

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- Nov 22nd 2017, 03:55 PM #1

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- Nov 22nd 2017, 04:03 PM #2

- Nov 24th 2017, 06:46 AM #3

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- Nov 24th 2017, 11:58 AM #4

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- Nov 24th 2017, 12:44 PM #5

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