പിന്നെ ഇതിൽനിന്ന് ഡെറിവേറ്റീവ് പൂജ്യത്തെക്കാൾ കുറവായിരിക്കും ഇതിനർത്ഥം ഇത് കുറഞ്ഞുകൊണ്ടിരിക്കുന്നതാണ്.
ఇప్పుడు ఈ డెరివేటివ్ 0 కంటే తక్కువగా ఉంది అంటే ఇది తగ్గుతూ ఉంది అని అర్థం, ఇది ప్రతి కి నిజమవుతుంది.