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L=sum_{i=0}^{7} sin(i * 1/8) 1/8, R= sum_{i=1}^{8} sin(i * 1/8)1/8
L=sum_{i=0}^{7} sin(i * 1/8) 1/8, R= sum_{i=1}^{8} sin(i * 1/8)1/8
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