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2sin pi x

2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x2sin pi x