help with Integration, please!! (2 Viewers)

[Jason Xie]

hi guys, i didnt get this integration question, please help, this question was from my 4u teacher, show working please!! This time i check thousands of times to ensure to no typo, thank you so much guys..

 

[Jason Xie]

does anyone help me?

 

[jeffwu95]

hey bro ill help, i did this in 3u today

 

[mraznboy]

hey jun, you sexy boy

 

[jeffwu95]

 

[lolcakes52]

The first one has an x in the numerator, I didn't see you cancel it or anything.

 

[deswa1]

Are you sure the first question is correct? The indefinite integral for your function is http://www.wolframalpha.com/input/?i=integrate+x%2F%282%2Bcosx%29 whilst the definite integral you provided gives a value of http://www.wolframalpha.com/input/?i=integrate+from+3pi%2F2+to+5pi%2F2+x%2F%282%2Bcosx%29. The fact that wolfram gives a decimal rather than an exact value suggests that you didn't type the question right. Can you please check?

 

[asianese]

There are polylogs in the answer so the question is probably wrong.

 

[nightweaver066]

I think the first question should have a 1 in the numerator as when evaluating the second, you.need to perform a double substitution where one is the same as part (I).