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Mathematics: Post your doubts here!

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November 2012 P3, was the hardest paper which CIE released since 2002 ! :eek:
Lets hope we get one which will be much easier tomorrow so that we all can ace Insha Allah :)
the easier the harder to ace to harder the easier to ace
 

Jaf

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You found your limit in part i, which was 1/4 π. Now as you can see, before the area under the curve was denoted by A. Now they equated the integral to 40A, which means the area under the curve is 40 times bigger. Hence the limits are to be multiplied by 40.
kπ= 1/4π *40
k=10
I see. Thank you so much.
 
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Dude, just multiply your two answers from part i) to get one quadratic factor and find the other one by (Ax^2 + Bx + C) inspection.
That is, the roots you get in i) are 1 - √2 i and 1 + √2 i. So the factors become (x-1+√2 i)(x-1-√2 i). You multiply the brackets and you'll see everything in terms of 'i' gets cancelled to give you a quadratic factor of x^2 - 2x +3.

If you still don't get it, let me know I'll post a screenshot.
I get! Thanks a lot man! :)
 
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Hey, you switched your axis! You put the imaginary one in the real one!
OMGG THAT EXPLAINS IT ALL!!
When I add ninety degrees because now the Angle is in the second quadrant I get the right answer! Thanks!!
 
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What's driving me insane is, what in the world were they thinking sticking maths and chemistry in one day? And Stats and physics p4 two days later? They're HUGE papers- it's like they WANT us to do bad.

This meme makes SO much sense now:
3r7et2.jpg
I KNOW RITE !!!
i am sleep deprived :p
you know CIE ! always in the torturing mood xD
its like they get peace when they see us in pain xD
 
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i have a feeling a question of this type is coming tomorrow..pls can someone fully explain it question 10 second part

this is functions bro ....
P(x) = x^2 + 2x +3
P(1) = 1 + 2 + 3 = 6
p(x^2) = (x^2)^2 + 2 (x^2) + 3


now try to do that question
hope yu get it . ....
 
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The paper being too hard is not so good sometimes !
Because in the exam hall, you might get confused and you are stressed ! Then, you start messing around ! :s
yeah ik but being so easy is the worst because i am one of these dudes who can make so many silly mistakes because of exam stress lol
 
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this is functions bro ....
P(x) = x^2 + 2x +3
P(1) = 1 + 2 + 3 = 6
p(x^2) = (x^2)^2 + 2 (x^2) + 3


now try to do that question
hope yu get it . ....
no bro i didn't get it :/ can u show the solution of this question..only the last part pls
 
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yeah ik but being so easy is the worst because i am one of these dudes who can make so many silly mistakes because of exam stress lol
Agreed ! same here !
Lets hope the paper gonna be average, Insha Allah ! :)
 
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