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

You are not logged in.

- Topics: Active | Unanswered

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

*Last edited by ShivamS (2014-08-26 03:00:45)*

Offline

1.

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

Hi;

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

bobbym wrote:

Hi;

That is correct.

Offline

By the way, the constants are not unique.

Is the solution for 1 wrong?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

Can you show another pair?

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

Agnishom wrote:

By the way, the constants are not unique.

Is the solution for 1 wrong?

Your first equation is correct, but not the second one.

The constants are unique, as bobbym showed.

*Last edited by ShivamS (2014-05-01 01:29:40)*

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

*Last edited by ShivamS (2014-05-01 01:48:21)*

Offline

You are correct. Sorry

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,658

Hi ShivamS

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

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

anonimnystefy wrote:

Hi ShivamS

Both are correct.

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

3. Let E be an even function and O be an odd function. Determine the symmetry, if any, of E ∘ O.

*Last edited by ShivamS (2014-05-01 07:39:06)*

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

Full Solutions with explanation:

1. Find the general formula for all solutions of 2 cos x + 1 = 0

2. Find the constants b and c in the polynomial p(x) = x^2 + bx + c such that

. Are the constants unique?I'll add all the problems and full solutions in the first post too.

*Last edited by ShivamS (2014-05-01 07:52:09)*

Offline

ShivamS wrote:

3. Let E be an even function and O be an odd function. Determine the symmetry, if any, of E ∘ O.

What does That mean?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,658

Hi ShivamS

*Last edited by anonimnystefy (2014-05-01 22:14:09)*

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

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

Agnishom wrote:

ShivamS wrote:3. Let E be an even function and O be an odd function. Determine the symmetry, if any, of E ∘ O.

What does That mean?

Which part do you not understand?

anonimnystefy wrote:

Hi ShivamS

That is correct.

Offline

What does the notation E ∘ O mean?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

That is a composition of functions.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

Is it Kaboobly Doo?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

Heavens no! It is quite useful. There are practical applications for it.

**In mathematics, you don't understand things. You just get used to them.**

Offline

The URL contains the string 'sets'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

Have you been there yet?

**In mathematics, you don't understand things. You just get used to them.**

Offline

**ShivamS****Member**- Registered: 2011-02-07
- Posts: 3,629

Set theory is introduced in India in grade 11 and the Indian government controlling education is smart, so they introduce functions (and therefore inverse functions, composition etc) after set theory in grade 11. I believe it is the first unit in grade 11, so Agnishom will be able to solve that problem soon.

Offline

Yes, bobbym has taken up the math teacher post in our school.

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 90,655

Yes, I have and I am a tough marker.

**In mathematics, you don't understand things. You just get used to them.**

Offline