To evaluate: The integral .
The value of the integral is .
From the exercise 49, it is known that if , then .
Therefore, the given integral becomes,
Simplify further as,
Thus, the value of the integral is .
To evaluate: The integral and .
The value of the integral is and .
Rewrite the given integral as,
Thus, . (1)
From part (a), it is known that .
Simplify this as,
Thus, . (2)
Compare the equations (1) and (2), it is observed that and .
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