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# IAL 2018 June F3 watch

1. For the people whom took the test, I made one cuz I couldn't find it. I felt paper was quite easy going till question 7 but the last question (question 8) which was a integration really blew my mind.
There weren't question 9 right? I can't remember.....
2. (Original post by louiehan0110)
For the people whom took the test, I made one cuz I couldn't find it. I felt paper was quite easy going till question 7 but the last question (question 8) which was a integration really blew my mind.
There weren't question 9 right? I can't remember.....
Yep, I'd say the exam was pretty easy as well. About the last question reduction formulae, you just had to do a simple splitting and do parts by integration once, then split (x^2 + k^2) ^1/2. I think there was a similar question in a GCE AL paper.

What're your expected grade boundaries for A*?
3. 69？
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4. Also anyone fancy an unofficial mark scheme
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5. Was I the only one who found it hard?
6. I will say 67~68 last integration nearly killed me. Luckily I solved in last minute. But everyone there weren't question 9 right?I am bit worried
7. Anyone remember the equation of the plane in the matrix transformation?
8. (Original post by louiehan0110)
I will say 67~68 last integration nearly killed me. Luckily I solved in last minute. But everyone there weren't question 9 right?I am bit worried
Do you remember the equation of the plane in the inverse matrix question? What was the angle between OA and the line L?
9. (Original post by louiehan0110)
I will say 67~68 last integration nearly killed me. Luckily I solved in last minute. But everyone there weren't question 9 right?I am bit worried
Do you remember the equation of the plane in the inverse matrix question? What was the angle between OA and the line L?
10. (Original post by Electric-man7)
Do you remember the equation of the plane in the inverse matrix question? What was the angle between OA and the line L?
was it something like 54.6 or 56.4?
11. I remember it was something like that (I think 55?) so yeah probably right. Do you rememeber the equation of the plane, I found 3 points on the the plane then I found 2 vectors and then I used the cross product to determine the equation of the plane, I got something like 11x+something something=8, what did you get? Someone said I could have just mutliplied the normal of the second plane by the inverse matrix to get the normal of the first plane but I am not convinced because I am pretty sure matrix transformations do not necessarily keep angles the same.
12. (Original post by Electric-man7)
I remember it was something like that (I think 55?) so yeah probably right. Do you rememeber the equation of the plane, I found 3 points on the the plane then I found 2 vectors and then I used the cross product to determine the equation of the plane, I got something like 11x+something something=8, what did you get? Someone said I could have just mutliplied the normal of the second plane by the inverse matrix to get the normal of the first plane but I am not convinced because I am pretty sure matrix transformations do not necessarily keep angles the same.
I can’t remember the exact answer I got but I multiplied the normal by the inverse matrix
13. (Original post by user_12345)
I can’t remember the exact answer I got but I multiplied the normal by the inverse matrix
Wait is this a correct method?
14. No cause it contradicts the definition of linear transformation

(Original post by Electric-man7)
Wait is this a correct method?
15. Ahh, thankfully I did not do that, do you remember your plane's equation? Anyways enjoy summer, I think I saw you on the STEP thread.

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