8cos^3 10 - 6cos 10 =?
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2cos10 (4cos^2 10 - 3)
2cos10 ( 4 - 4 sin^2 10 - 3)
2cos10 (1-4sin^2 10)
2cos10 (cos ^2 10 - 3sin^2 10)
2cos10 (cos 20 - 2sin^2 10)
2cos10 (cos 20 +cos20 - 1)
2cos10 (2cos20 - 1)
2cos10 ( 4 - 4 sin^2 10 - 3)
2cos10 (1-4sin^2 10)
2cos10 (cos ^2 10 - 3sin^2 10)
2cos10 (cos 20 - 2sin^2 10)
2cos10 (cos 20 +cos20 - 1)
2cos10 (2cos20 - 1)
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