574 replies to this topic

[IB Smacher Glau]

This Q is For P2 Math Hl .. in the image below the last Q how can we do it using the GDC ?
http://img594.images...20/photo2rr.jpg

[Desy Glau]

Just tabulate the data in your calculator. There will be an option for probability stuff. Which TI do you have? Would be best to ask somebody who has the same type of calculator.

[IB Smacher Glau]

Desy Glau, on May 01, 2012 - 10:28, said:

Just tabulate the data in your calculator. There will be an option for probability stuff. Which TI do you have? Would be best to ask somebody who has the same type of calculator.

Ti-84 ! the problem is that I dont know what values I need to input the upper values or the down values from the table ?

[Desy Glau]

Oh. Mid value.

[IB Smacher Glau]

Any Idea !!
this might come 2moro
P(BIA)=1/3
P(BIA')=3/4
P(A)=3/5
find P(B') and P(AIB) ?
any Ided how to tackle this Q the final answer is P(B')=0.5
and P(AIB)=2/5

[Smile44]

Any tips for the math SL exam tomorrow? Easy? Hard?

[MariusIBDP]

My question is 5 in the following link:
http://failai.in/sho...Exercise_2A.jpg
Wait 10 s., push 'Pirmyn' (the green button). Trust me, no virus

Have no idea how to do anything in that exercise, except that Period is 2p-240.

[~Deshani~]

Do I have to wait til July to know what my IA grade was in Math Studies?

[Where Love Died Laughing]

~Deshani~, on May 05, 2012 - 15:47, said:

Do I have to wait til July to know what my IA grade was in Math Studies?

Yes. As far as I know we get our final point grades on the 6th and a few days later our exact grades for each section (IAs, papers, etc)... Not sure if that's true, but I recall the teacher mentioning that. However, your teacher probably told you what he gave you? This might be moderated, but it's usually about 2 points or so, nothing drastic...

[Manani]

What is the integration of x²/(x²+1)

[The Economist]

Manani, on May 25, 2012 - 10:27, said:

What is the integration of x²/(x²+1)

 integral.png   16.78K   0 downloads

[Manani]

What happened to the x² in the numerator? where did it go?

[The Economist]

Manani, on May 25, 2012 - 10:49, said:

What happened to the x² in the numerator? where did it go?

Don't you see I added +1 and -1? Then split the fraction. One fraction is x^2+1/x^2+1 and the other is -1/x^2+1

[Manani]

ohh yes i got it
How would you solve this:
FInd the integration of e^x/(e^2x+9)

[Drake Glau]

using | for integral sign
|(e^x)/(e^2x+9)dx
Let u=e^x therefore du=e^xdx so dx=1/e^x
Plug stuff in and you get |1/(u²+9)
Quickly notice that it's ALMOST arctan and actually is a form of it. You just need to get that 9 out of there somehow.
Now it might just be too early for me but I checked my answer with Wolframalpha and got something different but I don't know what they are doing.

Factor that nine out of the bottom so you have (1/9)|1/(u/9)²+1
That gives you an answer of (1/9)arctan(u/9) or (1/9)arctan(e^x/9)

Wolfram alpha got (1/3)arctan(u/3) which didn't seem right, take the derivative and I didn't get the integrant you posted
*Derivative of (1/3)arctan(u/3) is 1/(u²/3)+3 isn't it? O.o