C3 may2012 preparation.

[Youssef Ali Mohammed]

youssef are u serious? that question is the easiest question in the paper.
Listen whenever u see a question that has ln or e: then u must know immediatly that these values can be equal to 0 when they are minimum.
In this case, as t progress to infinity, in other words as time becomes really large e^-0.05t becomes zero. Try it get ur calculator and put e^-.052(1x10^66) or something,
Since that is zero, then the only part of the equation left is the +25. So the temp can never go below 25. therefore it never reaches 20.

ahaaaaaa i totally forgot that point -.- Thanks alot sorry if i've been buggy bout it..

 

[Evolution]

yah, just put in your mind, whenever u c e or ln, these values can be 0 at min.

 

[Youssef Ali Mohammed]

thanks alot anyhow i pretty much revised everything, finished p.p. twice, finished Soloman and did 2 practice paper exams as well as random text book questions.. i hope im ready enough .. night guys

 

[étudiante]

thanks alot anyhow i pretty much revised everything, finished p.p. twice, finished Soloman and did 2 practice paper exams as well as random text book questions.. i hope im ready enough .. night guys

WoW! dats quite a lot of practice MashAllah All the best to u all And good night

 

[Evolution]

rabina yeyasar

 

[Evolution]

hey guys how do I do cos^2 of any number? I just wanna make sure

 

[étudiante]

hey guys how do I do cos^2 of any number? I just wanna make sure

u mean to find the value from the calculator? :S

 

[Evolution]

ya

 

[étudiante]

u calculate cos x n den square the answer

 

[Evolution]

thanks, just wanted to make sure

 

[étudiante]

thanks, just wanted to make sure

urw n no problem good to be sure

 

[Evolution]

guys for question 8c in jan 2012, what the hell was that?? why did they change the formula to get the second angle?

 

[xIshtar]

guys for question 8c in jan 2012, what the hell was that?? why did they change the formula to get the second angle?

If you look at pi - the angle, it is in the second quadrant, where tan is negative. By this logic, tan is negative in the 4th quadrant 2, as the association accute angle is the same.

Atleast, thats how I saw it

 

[Shuvo Mehedi]

So how was the exam?????

 

[AhmedMans]

It was alright.
In question 7 (or question with e and ln) range was y>2 and domain x>2, right?

 

[Youssef Ali Mohammed]

It was alright.
In question 7 (or question with e and ln) range was y>2 and domain x>2, right?

Yeh i did that too, the exam was pretty good actually. i was COMPLETELY unable to get the prove for sec^2 , but thats about it ^_^

 

[Shuvo Mehedi]

It was alright.
In question 7 (or question with e and ln) range was y>2 and domain x>2, right?

Yeah I also got that.....btw what were the values of x1,x2 and x3 that we had to find using the iterative formula??

 

[AhmedMans]

First one was 1.41 I think, I don't remember the rest.

 

[Evolution]

Yeah I also got that.....btw what were the values of x1,x2 and x3 that we had to find using the iterative formula??

that one was easy

 

[Youssef Ali Mohammed]

Hey evo did you do the proof? The trigonometry one