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#' Normal copula
#'
#' @description returns the density function of Normal copula
#' @export
#' @keywords internal
#'
#'
dNormal <- function(u,v,theta){
x <- qnorm(u)
y <- qnorm(v)
(1 - theta^2)^(-1/2) * exp(-(x^2 + y^2 - 2*theta*x*y)/(2*(1-theta^2))) * exp((x^2 + y^2)/2)
}
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