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1/6 sin^6(x) - 1/8 sin^8(x) - (-cos^4(x)/4 + 2 cos^5(x)/5 - cos^6(x)/6)
1/6 sin^6(x) - 1/8 sin^8(x) - (-cos^4(x)/4 + 2 cos^5(x)/5 - cos^6(x)/6)
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