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this expression is of the form ζdx/(x²-a²) =1/2a log((x-a)/(x+a)).....
so if u hold a²=1/2 and solve accordingly u will get the answer....
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i want to know what happens to the 2, which is taken out
from the equation
its a constant it wud be out of the integration after ur result ....multiply it with the constant
D x\2x^2-1=x\2x 
=1\2 answer
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