Help with C4?

[Hasan Naqvi]

https://eiewebvip.edexcel.org.uk/Reports/Confidential Documents/1006/6666_01_que_20100618.pdf

hey guys, check out question 6b. why did they take f(x) as cos2theta ? :/

 

[St0cK]

I don't understand your question? Can you make it more clear so i can help?

 

[Hasan Naqvi]

I don't understand your question? Can you make it more clear so i can help?

can you just tell me how to solve part b? i dont get what they did in the ms.

 

[St0cK]

Okay, so its the integration of theta multiplied by F(Theta), so you just multiply theta by (1/2 + 7cos(2theta)/2) the you take half as a common factor and just integrate it...

 

[Hasan Naqvi]

Okay, so its the integration of theta multiplied by F(Theta), so you just multiply theta by (1/2 + 7cos(2theta)/2) the you take half as a common factor and just integrate it...

i did that. but they did something else in the marking scheme. they took f(theta) as cos2theta. what about the 1/2 and 7/2? http://www.edexcel.com/migrationdoc...lum 2000/june2010-ms/6666_01_msc_20100714.pdf

 

[St0cK]

i did that. but they did something else in the marking scheme. they took f(theta) as cos2theta. what about the 1/2 and 7/2? http://www.edexcel.com/migrationdocuments/QP GCE Curriculum 2000/june2010-ms/6666_01_msc_20100714.pdf

in the mark scheme they skipped some steps but the answer is correct, here is how i solved it.

Tell me if there is anything you don't understand.

 

[Hasan Naqvi]

in the mark scheme they skipped some steps but the answer is correct, here is how i solved it.

Tell me if there is anything you don't understand.

owwwwwwh, got it! thanks alot bro