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2sin π x

2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x
2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x
2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x2sin π x