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Numerical integration in a function

f(x,y)=numerical_integral(1/d*2*x*y,.01,Infinity)[0]
Error

So what I want is to the integration wait until after the variables have been substituted so that it is able to numerically integrate. (Yes I need to numerically integrate. This is a simplified form that reproduces the same result.)

f(3,1)=numerical_integral(1/d*2*3*1,.01,Infinity)[0]
406.69135669845798

I thought there might be a way using a lambda defined function, but I was unable to find one.