maths p32 answers

[Goodfella]

hmm, well if you're right, this means a loss of 1 mark, coz we were right everywhere else!

 

[ffaadyy]

Not bad

 

[aaditya menon]

wouldn't e^2x/2 get cancelled when we take ln?

The question was dy/dx=e^(2x+y) right?

dy/dx=e(2x+y)
dy/dx=e^(2x) x e^( y )
[1/e^( y )] dy = e^(2x) dx
e^(-y) dy = e^(2x) dx

Integrate both the sides.

-e^(-y) = [e^(2x)/2] + c

Put x=0 and y=0 to find the value of 'c'.

-e^(-y) = [e^(2x)/2] + c
-e^(-0) = [e^(0)/2] + c
-1 = (1/2) + c
-1 - (1/2) = c
-3/2 = c

Put back this value of 'c' in the integrated solution.

-e^(-y) = [e^(2x)/2] + c
-e^(-y) = [e^(2x)/2] - (3/2)

Multiply the equation by a '-' sign.

- {-e^(-y) = [e^(2x)/2] - (3/2)}
e^(-y) = (3/2) - [e^(2x)/2]

Put 'ln' on both the sides.

ln e^(-y) = ln {(3/2) - [e^(2x)/2]}
-y = ln {(3/2) - [e^(2x)/2]}
y = - ln {(3/2) - [e^(2x)/2]}

Therefore, the answer was 'y = - ln {(3/2) - [e^(2x)/2]}'.

You can simplify this further.

Final answer : y = ln(2/(3-e^2x))

 

[WhereAmazingHappens]

paper was hard
hope thresholds will be low


pretty disappointing after seeing how easy m1 and p1 was. i was going for A* in maths but...oh well.....

 

[umerrox]

I got 1-x+1/2x^2 and I'm pretty sure it's correct. I will have all the correct answers in about 2 hours though

yes mine was also 1/2 but what was the method you applied

 

[ffaadyy]

You can simplify this further.

Final answer : y = ln(2/(3-e^2x))

Good thing but doesn't really matter. Both the solutions are correct. It's just like I am writing it as 'y = -1 + 2' while as you are writing it as 'y = 2 - 1'.

 

[Sannikutti]

guys what will happen if idid not arranged the answer sheet in order but i have written the questions numbers on the side some one pls? pls help so

 

[leosco1995]

guys what will happen if idid not arranged the answer sheet in order but i have written the questions numbers on the side some one pls? pls help so

Did you do the parts of the questions in order? As long as you did that, I think you should be OK.

 

[Sannikutti]

Did you do the parts of the questions in order? As long as you did that, I think you should be OK.

ya
i did that in order and for each part I havee written it in one page and no continuation on other page and if there was continuation i have written question number and part of that question beside it and on the top of it,like question 2 part ii and etc
so do u think thts fine ?

 

[Sannikutti]

ya i did that in order and for each part I havee written it in one page and no continuation on other page and if there was continuation i have written question number and part of that question beside it and on the top of it,like question 2 part ii and etc so do u think thts fine ?

 

[Zaryab]

the answer to vectors third part is wrong. i think the distance was 12 between two points.

 

[Zaryab]

can anyone pls send me the question paper ?

 

[Zaryab]

my email address is [email protected]

 

[OrlandoBloom<3]

I always feel so ignored here No one notices my post Btw my email is [email protected] Please email the copy ;D

 

[Utsav Karkee]

Yaar according to some toppers and me the only answer to volume question was 1 by 4 pi e^2

well almost everyone in my school got (pi/4)(e^2 - 1). I am very confident that's the correct answer for the volume.

 

[Utsav Karkee]

uhm weren't there 3 stationary points in q 6, as in pie/2, pie/12 and 5pie/12?

yes u r right bro. there were definitely 3 stationary points. pi/2, pi/12, 5pi/12.

 

[Utsav Karkee]

No, there were two and the point was minimum point, according to what i solved.

I think due to range bcoz range was less not 360,
though i dont exactly remember!

there were 3 dear brother. and the point was a maxima, not a minima!

 

[Utsav Karkee]

I have the exam paper infront of me right now, it says 0 < x < pi

yeah and there were 3 stationary points! XD pi/2 was one of them!!!

 

[Utsav Karkee]

i got the ans= 1-x+1/4x^2

i guess u need to check again! the answer clearly is 1 - x + (1/2) x^2

 

[Roshan Asghar]

aaditya menon. Can you please send me the MATHS P3 at [email protected]?