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# Help with Q6 from the C4 exam?

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1. In question 6! i cant remember the exact question but think it was:

u = 4sin^2(x)

prove = integral (4/(1-4x)^1/2 is same as (k integral sin^2(u)) where you must find k.

the prove that the integral = k (integral) sin^2x i got 1/8 (integral) sec^2x.

Where did i go wrong and how many marks would i have got for the follow up question if i used k= 1?8 instead of k =8?
2. (Original post by twigface)
In the prove that the integral = k (integral) sin^2x i got 1/8 (integral) sec^2x.

Where did i go wrong and how many marks would i have got for the follow up question if i used k= 1?8 instead of k =8?
Your question doesn't make sense as it stands, please edit and clarify.
3. (Original post by twigface)
In the prove that the integral = k (integral) sin^2x i got 1/8 (integral) sec^2x.

Where did i go wrong and how many marks would i have got for the follow up question if i used k= 1?8 instead of k =8?
you mean lambda not k right? all the method marks minus accuracy if you did it right
4. (Original post by WillRose)
you mean lambda not k right? all the method marks minus accuracy if you did it right
yeah i think so.

do you remember what the question was?
5. (Original post by Zacken)
Your question doesn't make sense as it stands, please edit and clarify.
ok written out the question
6. (Original post by twigface)
yeah i think so.

do you remember what the question was?
so probably 4/5?
7. (Original post by WillRose)
you mean lambda not k right? all the method marks minus accuracy if you did it right
actually refresh if you've seen this as i have edited
8. Not sure how you got sec^2T

The 8 came from the dx/dT where T = theta
I can't really remember the question but I remember something along the lines of tanx*8sinx*cosx I can't remember what was squared and what wasn't

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