Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

1)

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

hi gAr

thanks for opening the topic!

I needed this.

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

I'm not sure i know how to do this one but it shoud be e^(1/6).

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi anonimnystefy,

You're welcome!

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

hi gAr

I still can't seem to get it

All I got is the given expression is the same as

and*Last edited by anonimnystefy (2011-07-26 22:41:42)*

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi anonimnystefy,

*Last edited by gAr (2011-06-27 15:23:41)*

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

Hi all;

Wunderbar!

I think it is obvious that gAr has the Ramanujan touch! Even his typos are cool.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi bobbym,

I'm nowhere near Ramanujan!

That typo wasn't deliberate, but glancing at that I too think it's cool!

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

2)

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

hi gAr

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi anonimnystefy,

Have you studied integration?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

nope.

Here lies the reader who will never open this book. He is forever dead.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,365

Hi gAr;

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

**Online**

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Okay.

I hope you can search about that during your spare time.

Anyway, I'll tell briefly the concept of getting the answer.

Learn during your spare time. Very interesting!

Hi bobbym,

That's correct !

*Last edited by gAr (2011-06-27 23:39:40)*

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

hi gAr

think i get it.

i have read something on integrals but thats only the basic stuff.For example i wouldn't know how to calculate ∫1/(a^2+x^2)dx

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi anonimnystefy,

That's great!

But before going to integrals, know differentiation clearly.

Otherwise you'll have trouble remembering some results!

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

hi gAr

the only problem i have with diff. is i have difficulties when it comes to products and function composition.

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

For example?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

I got confuzed with derivative of:

I got it in the end but a little harder than it maybe should be.

*Last edited by anonimnystefy (2011-06-28 00:32:04)*

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

I always take logarithms and then take derivative for such problems!

Extra effort is during simplification, but easier than quotient rule.

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

So how would you do this one?

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Hi,

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline

**123ronnie321****Member**- Registered: 2010-09-28
- Posts: 128

Hi anonimnystefy,

This one is for you!

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,522

I think it should be \lim_{x\to-\infty}.

*Last edited by anonimnystefy (2011-06-28 01:37:55)*

Here lies the reader who will never open this book. He is forever dead.

Offline

**gAr****Member**- Registered: 2011-01-09
- Posts: 3,479

Answer exists for -∞ also.

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

Offline