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derivative 3x / 256 - (1 / 256)·sin4x + (1 / 2048)·sin8x - (1 / 320)·(sin2x)^5
derivative 3x / 256 - (1 / 256)·sin4x + (1 / 2048)·sin8x - (1 / 320)·(sin2x)^5
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