Explanation: 
Another Explanation (5):
∫e21 (1/2x) dx এর মান নির্ণয়:
আমরা জানি, ∫ (1/x) dx = ln|x| + C , যেখানে C একটি ধ্রুবক।
সুতরাং,
∫e21 (1/2x) dx = (1/2) ∫e21 (1/x) dx
= (1/2) [ln|x|]e21
= (1/2) [ln(e2) - ln(1)]
= (1/2) [2ln(e) - 0] [∵ ln(1) = 0]
= (1/2) [2 * 1] [∵ ln(e) = 1]
= 1 🥳
অতএব, ∫e21 (1/2x) dx = 1 😊