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The function is .
The function is continuous in the interval .
The function is .
Derivative on each side with respect to .
Derivative is always negative, so it is always decreasing on the interval .
So the function is one-to-one function and is strictly monotonic.
From theorem 5.9 : .
Equate to .
By trial and error process we will get .
Thus,
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Substitute in above expression.
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Consider .
Substititue in .
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