Thanks for notifying us.


Alright. But, I think I'll be better at this when I do a lot of practices later on. For now, I'm just trying to get myself acquaint with differentiation, implicit differentiation specifically because I'm weak at it.

Alright, so I guess my answer along the ones from the book are accepted, since the only differences is the +/- signs of our numerators and denominators, thanks.

To be frank, I reckon I will not be happy with my ''first ang pau'' that I'll receive for this forthcoming CNY, for a long, long time....

Same here. My PA teacher approves some topics that aren't approved by several PA teachers from the other schools, and vice versa. Now that you're already on your introduction, I guess you should just keep going on it. Try to regularly get your teacher to have a check on your work(even if it is trivial), so as to prevent yourself from going astray.

Neither will I. I will choose to face it after CNY instead....

There's no difference between yours and the answer... They are identical...

On the final post(Post#720) of the previous page, I couldn't prove that . Where were my errors? I redid it again and again, but I failed to get to the solution. It's frustrating.

When you have a fraction, I suggest you bring the denominator up to the other side and do implicit differentiation. Then it is very likely you will make less mistakes as you won't obtain a negative power.

Isn't it obvious?



This post has been edited by Critical_Fallacy: Jan 29 2015, 05:14 PM

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This post has been edited by Taylor's University: Jan 29 2015, 03:05 PM

Pardon me for my ignorance, but, do you meant it to be like this?

Let ,
∴ Differentiation of y is:

Kawan,

You've just re-derived Quotient rule.

When facing differentiation problem, you need to decide whether it is more efficient to use direct differentiation or implicit differentiation. Implicit differentiation in this case makes things complicated (for human) due to the nature of derivatives of trigonometric functions. For solving by hand, implicit differentiation is more suitable for polynomial functions.

Yes.

But unless the question specifies for it, you don't have to specify dy/dx in terms of y or x. Just continue differentiating until you proof what you are asked to proof.

You will encounter much more polynomial functions in Maclaurin Series and it is simply impossible for you to use that quotient rule repeatedly when during repeated differentiation. Implicit would be much more convenient.

This post has been edited by Just Visiting By: Jan 29 2015, 05:57 PM

My suggestions:

(1) Understanding Cultural Heritage: Learning from 1 MALAYSIA

(2) Extremism: A Threat to Cultural Diversity in Malaysia

(3) Contemporary Perspectives on Cultural Practices in Malaysia

(4) When Ways of Life Collide: Rethinking Cross-Cultural Approaches to Malaysian Harmony

This post has been edited by Critical_Fallacy: Jan 29 2015, 05:59 PM

Oh, I see. So, if I were to differentiate a function, say, by using implicit differentiation, I will soon arrive at a what we call a Product rule:



Thanks for the lesson. I'm not good at differentiation yet, even simple differentiation questions involving exponents, can trip me off. I need more time to be good at it.

Thank you for your advice.

Just Visiting By and scgoh123, I have some questions here about PA:

-Do we need to underline our graph's title if every alphabet in it are in capital size? My PA teacher says that it'll be redundant to draw a line under our title if every words are in capital size.

-Can we simply shade or draw simple patterns on our pie chart/bar chart instead of colouring them with colour pencils? My friend told me that his PA tuition teacher(a proclaimed PA marker) informed him that without colouring our graphs, our marks will be deducted.

-When drawing the y-axis, is there a height limit to which it shouldn't exceed? Like, in some cases of mine, my teacher said that my y-axis were too long(like 14cm,16cm...).

-This question is absolutely trifle(and pointless), yet, I can't help but notice that the x-axis for every single graph in my book was elongated at the origin. Is it necessary to do so?

-Personally I would underline under the title. My teacher, who is STPM paper marker, had informed us that the title must be written in capitals and prefably underline it.

- No, if you merely put some shades, then you will be heavily penalized by 12 marks. My teacher told me that, and you are not the only one who find that coloring graphs is a pain in the neck. Seriously, it took a lot of time to color it, while the time wasted can be used for finishing essays.

-basically 14-16 cm is way too much because you won't have any space left for doing the petunjuk and write the summer. We are bound to drawing graphs as big as to fit the whole graph paper, but in PA you need to consider the space meant for other things too. Usually 10-12 cm is the best.

- no, it's not necessary.

1) There are two ways to write the titles: one is to write everything in capital letter, and another is to only capitalise the first letter but underline the whole title. For example:
a) MALAYSIA: HARGA BUAH-BUAHAN DARI TAHUN 2005 HINGGA 2008
b) Malaysia: Harga Buah-Buahan Dari Tahun 2005 Hingga 2008

However, majority of people, including I, chose the former. The marking scheme for PA has also become extremely rigid and much stricter so I do not know whether the two options I mentioned above are still acceptable. If every words are in capital, it is hence indeed redundant to underline them again.

2) Shading the graph was accepted but beginning STPM 2013 it is no longer accepted. You must colour them.

3) No, there's no official height limit but there are patterns. Normally we should only have six to eight y-axis labels (meaning 12cm to 16cm). Do note that STPM graph papers is only 18 x 22, and since you need to leave space to write your title, petunjuk and sumber, you are best advised to keep your graph small but readable. Do note that sumber must be written below petunjuk, it cannot be on the same line as petunjuk.

4) It is not necessary, I guess, but it personally think it is encouraged.

Do mind
- the title
- the axis labelling
- the unit
- skala, make sure you write it correctly and calculated correctly.
- add the word 'anggaran' where necessary (according to your passage)
- put a 0 at the origin
- write sumber
- sumber cannot be on the same line with petunjuk. must be below petunjuk
- colour the graph, do not shade
- draw correctly, don't calculate wrongly and thus draw wrongly
- identify which graph to draw
- your graph does not exceed your largest reading at y-axis
- try to complete your graph in 30 minutes

Have fun! Graph drawing is the best part of PA!

Thanks! You have shone a light for me!!!!!!!!!

I forgot to use trigo identities to solve the problem....how dumb am I!
The question that he showed is the one that I am facing right now, I asked teacher and she got stuck halfway too...
RED-HAIR-SHANKS that question is a clone of STPM 2001 question.

Thank you so much! Both of you have done a great job in clearing my doubts away. I will treat them as my primary guidelines when it comes to graph drawing in PA. Oh, just another question here. Is it safe to simply assume that the word ''menjadi'' and ''kepada'' in the petikan means the exact jumlah for something?

For example
''Nilai eksport buah-buahan pada tahun sebelumnya mengalami peningkatan sebanyak 2.3%, atau RM 25 juta kepada RM 310 juta pada tahun 2012.''
-So, is it safe to right away tabulate RM 310 juta for the category of eksport buah-buahan in year 2012?

I ask this because after I did a few practices, I realised that there were same keywords in the petikan that refers to the exact value for any category in any given year.