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    • Thread Starter
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    Thanks for all the help.
    • PS Helper
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    For your first question, your answer is right, so don't worry about it looking weird!

    As for your second question, sub it in and see what happens. Remember that you need to substitute for dx as well. Also, consider the identity 1+\tan^2 \theta \equiv \sec^2 \theta.
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    Find what dx is equal to then use the formula nuodai hinted.It should start becoming clear from their.

    Don't forget to change the limits as well. post again if you get stuck and tell me where you got up to and I'll try and say where to go next.
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    is the answer (pi+2)/8 ?
 
 
 
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