first look at the working formula and condition of it of its derivation, working formula is not enough, you should know how it is derived because during derivation there are some conditions applied and in experiment you have to fulfill those conditions. This is very important.
आता आपल्याला हे सूत्र कसे आले हे समजून घ्यायला हवे कारण हे सूत्र आणताना आपण काही अटी ठरविल्या आहेत तेव्हा प्रयोग करताना देखील आपल्याला त्या अटी पूर्ण करायला हव्यात.