Use the substitution x = 1/u to find the value of
Please help me to solve this.
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Substitute this in the integral, it should give something interesting.
Note how the wording is just a little strange. "to find" isn't the usual task, is it?
Do the substitution. What happens?
Note the symmetry of the substitution with the limits of integration.
Hint: How many Numbers, R, can you think of where R = -R?
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