Math 32....how was it? :/

[AGEG]

What was the solution of the differential equation? Was it y = ln(2/3-e^2x)

I got ln(-1/2e^2x - 3)

 

[Bulltyro]

nothing will happen to your seperate sheet, don't worry as long as it stays attached to your bundle and the work done on it resembles the work on the other sheets (question)

 

[OakMoon!]

Your equation doesn't satisfy the condition attached with the required solution of the differential equation; that is, when x=0, y=0.

That is because the denominator was 3-e^2x and not e^2x-3 as written by 123add1.

 

[mukki]

I got ln(-1/2e^2x - 3)

i got -ln(2e^2x-3 / -1) :/

 

[Saiyan]

the paper was shit ! The last question of vector iii and the volume one, I lost roughly abt 15-20pts.
Another reason is that I just can't deal with the nervous. took long time for me to solve easy questions.
I dunno why, when I did the past paper exam, I normally did it with like 45-1hr to finish the papers. but today I didn't have enough time and made some silly mistakes. ( I did believeI could get abt 65-70 )
Really really disappointed,frustrated. Let me very down.

Don't worry too much. Give the other maths paper well. Are you a S1, S2, M1 or M2 student. I am an S2 student hoping to do well in that exam.

 

[Saiyan]

I used (x)(ln(x)^2) as in lnx squared. ...is it right? :s
And for the cot question...I got sin2X .... No quadratic ...

The volume one was this Integration of pie{(ln x)2 x)}dx. You have to use integration by parts with u being (lnx) ^whole square not 2lnx. Many answered this question wrong! The du/dx will be lnx.lnx which requires the application of product rule. The final result will be pie/4(e^2-1)

 

[Saiyan]

Cosec2x=secx+cotx plz

First convert the whole equation into sinx and cosx. the equation will then turn from Cosec2x=secx+cotx into :
1/sin2x = 1/cox + cosx/sinx.
Use the double angle formula to convert sin2x into 2sinxcosx. Then use LCM method to solve the equation.

 

[Saiyan]

I did by exactly the same method and probably came down to sucha an equation!!
But my friends say tht as it is nt proven as an Identity so u cannot multiply (cos X) on both sides to cut it!!!
Any idea about it!??

And gyz wat was the answer to volume of revo Q?
I got pi((e^2)/2 -(1/2)) !!!!
And my friends who integrated lnx whole squared are getting the same answers!! :/

The answer was pie/4(e^2-1)
Sorry your answer is partially wrong

 

[sadman]

The answer was pie/4(e^2-1)
Sorry your answer is partially wrong

Oh!! Saiyan!! SMART!!!!! awesome...........keep up the good work though

 

[Sky8]

Anyone did variant 33 ? How was it ?

 

[beststriker]

can anyone plz mention the volume question??

 

[Zika999]

If I lost 15 marks, would I still get an A? Please reply ASAP

 

[earthling]

If I lost 15 marks, would I still get an A? Please reply ASAP

Yeah I wanna know too!!!

 

[Saiyan]

Yeah I wanna know too!!!

I don't think so. What was your AS marks?

 

[Saiyan]

can anyone plz mention the volume question??

The diagram (given) shows y=x^0.5lnx. The shaded region between the curve, the x-axis and the line x=e is denoted by R.
(i) Find the equation of the tangent to the curve at the point where x=1, giving your answer in the form y=mx+c. [4]
Answer: y=x-1
(ii) Find by integration the volume of the solid obtained when the region R is rotated completely about the x-axis. Give your answer in terms of pie and e.
Answer: pie/4(e^2-1)

Hopefully I may get an A*.

 

[earthling]

I don't think so. What was your AS marks?

An A in AS...

 

[Saiyan]

An A in AS...

I mean the percentage. Cambridge grades the AS and A2 equally with p1 and p3 carrying 2/3 of the marks

 

[mukki]

if i get 68 in this paper will i be able to get an a* in p3?

 

[princesskt]

my mechanics paper was so bad i lost 18 marks but p3 went well just gonna lose 5-6 marks...............got A in as can i get a* plzzzzzzzzzzzzzzz helpppppppppppppppppp....................................

 

[Saiyan]

if i get 68 in this paper will i be able to get an a* in p3?

That's right! 68 is roughly 91% so its an A* but still you have to score good marks in the other papers. For me I flunked my P1 exam last year but still managed to get a 91% because of my brilliant S1 exam. So A* is actually achieved with both the AS and A2 exams.