#' resta
#'
#' Esta funcion sirve para obtener la resta de dos numeros reales.
#'
#' @param x A number.
#' @param y A number.
#' @return The sum of \code{x} and \code{y}.
#' @examples
#' resta(1, 1)
#' resta(10, 1)
#' @importFrom stats var
#' @export
resta <- function(x, y) {
varianza <- var(c(x, y))
res <- x + y
res
}
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