Arre bhai, first you find integrating factor as e^(∫P dx), multiply whole equation by it, then left side becomes d/dx (y × IF) so you integrate both sides. Actually, padhte time mujhe laga tha yaad rakhna mushkil hoga, but saala loan ka monthly interest calculate karte karte integration bhi aasan lagne laga – har choti cheez ka hisaab rakho, toh sab fit ho jata hai.
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