Similarly, along the CO, where x is 0, so the dx term will be 0 and the second term will be also 0, because in the second term, we have this x and since x is 0, the second term will also vanish and the first will vanish because we have dx there.
x = 0 என்பதால், இரண்டாவது பதம் 0 ஆகும். dx = 0 என்பதால், முதல் பதமும் 0 ஆகும்.