NFTmall Chainlink VRF

NFTmall Chainlink VRF Contract. https://bscscan.com/address/0x49517FAafCE8379D793672218a9C05BCd8B777a3#code

https://bscscan.com/address/0x49517FAafCE8379D793672218a9C05BCd8B777a3#codebscscan.com

$f(x) = x * e^{2 pi i \xi x}$