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Hi, I'm trying to compile two functions into one function. the first funtion is called 'fs' which is self-made function, another function is from the built-in 'integration' function that is copy-paste-edited. If built separatey, these functions work well. However that is not the case if combines together, where certainly I made mistake somewhere when constructing the code. can someone help point out the mistakes for me please? Thanks! Aehan ____________________ intgfun<- function(a,b,c,mu,alpha,xi,upper, ...,subdiv...