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# Volumes of revolution help urgent two questions watch

1. Spent an hour trying to work out the answers to these questions and keep getting a different answer to what the textbook says so any help would be really appreciated.
1) volume bounded by the curve y=secx bounded by the lines x=0 and x= pi /4. Textbook answer is pi
2. if you integrate sec2x you get a well known function
3. (Original post by mathswillkillme)
Spent an hour trying to work out the answers to these questions and keep getting a different answer to what the textbook says so any help would be really appreciated.
1) volume bounded by the curve y=secx bounded by the lines x=0 and x= pi /4. Textbook answer is pi
Textbook answer is correct? Volume of revolution is:
4. (Original post by Zacken)
Textbook answer is correct? Volume of revolution is:
Oh Thankyou so much, I tried converting sec to 1/cos and then it all got a bit confusing
5. (Original post by mathswillkillme)
Oh Thankyou so much, I tried converting sec to 1/cos and then it all got a bit confusing
No problem.

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