Urgent,urgent,urgent help. show the working steps ,please.

鈭?(鈭傁僞2 ) = [log{1/(2*pi*蟽^2)} - {1/(2*蟽^2)}]

Set:

1. 聽 聽 聽渭 = 蟽虏

Then:

2. 聽 聽 聽鈭?[ ln( 1 鈦?(2鈰呄€鈰呂? ) - 1 鈦?(2鈰呂? ] 鈦?(鈭偽?
3. 聽 聽 聽鈭?[ ln( 1 鈦?(2鈰呄€鈰呂? ) ] 鈦?鈭偽?- 鈭?[ 1 鈦?(2鈰呂? ] 鈦?鈭偽?br> 4. 聽 聽 聽鈭?[ ln( 1 ) - ln( 2鈰呄€鈰呂?) ] 鈦?鈭偽?- 鈭?[ 陆 渭鈦宦?] 鈦?鈭偽?br> 5. 聽 聽 聽-鈭?[ ln( 2鈰呄€鈰呂?) ] 鈦?鈭偽?- [ -1 鈰?陆 渭鈦宦?]
6. 聽 聽 聽-(鈭?2鈰呄€鈰呂?鈦?鈭偽? 鈦?(2鈰呄€鈰呂? + 陆 渭鈦宦?br> 7. 聽 聽 聽-2鈰呄€ 鈦?(2鈰呄€鈰呂? + 陆 渭鈦宦?br> 8. 聽 聽 聽陆 渭鈦宦?- 渭鈦宦?br>
Substitute from (1) above into (8):

9. 聽 聽 聽陆 蟽鈦烩伌 - 蟽鈦宦?/div>

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many many thanks.