Function: invert(gradient[2](divide(divide(log(numbers("yxx"), numbers("per")), numbers("yxx")), log(numbers("yxx"), numbers("per")))) if divide(log(numbers("yxx"), numbers("per")), numbers("yxx")) > divide(divide(log(numbers("yxx"), numbers("per")), numbers("yxx")), log(numbers("yxx"), numbers("per"))) else log(numbers("yxx"), numbers("per")))
