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#2376 2012-12-24 22:06:17

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2377 2012-12-25 18:36:09

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1685 is correct. Good work!

#1686. Find 2 + 7 + 12 + ..... to 10 terms.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2378 2012-12-25 18:43:22

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,246

Re: Oral puzzles

Last edited by julianthemath (2012-12-26 12:12:06)


Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate
smile

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#2379 2012-12-25 22:07:25

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi;

Yikes! I gave the 10th term instead of the sum!


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2380 2012-12-25 22:11:06

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,016

Re: Oral puzzles

Hi ganesh

[hide=#1686]245[/hode]


“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
The knowledge of some things as a function of age is a delta function.

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#2381 2012-12-26 19:33:28

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi,

The solution #1686 is correct, julianthemath and anonimnystefy! Neat work!

#1687. In triangle PQR, angle Q = 90 degrees. Find tan P - cot R.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2382 2012-12-26 21:17:59

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2383 2012-12-27 12:50:14

mathaholic
Member
From: Earth
Registered: 2012-11-29
Posts: 3,246

Re: Oral puzzles

I think this is a right triangle.
So, I will compute:
180-90=90
Split:45
I don't know if tan P is 45
and cot R is 45, too.
rolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyesrolleyes


Mathaholic | 10th most active poster | Maker of the 350,000th post | Person | rrr's classmate
smile

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#2384 2012-12-27 19:10:57

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym and julianthemath,

The solution #1687 is

Excellent, bobbym!

#1688. Given 15 cot A = 8, find sin A and sec A.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2385 2012-12-28 08:15:59

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2386 2012-12-28 17:54:07

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1688 is perfect. Smart work!

#1689. If cot θ = 7/8, find the value of


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2387 2012-12-28 22:52:16

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

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#2388 2012-12-29 18:43:58

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1689 is correct. Good work!

#1690. If

, find cos θ  and tan θ.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2389 2012-12-30 01:08:07

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Offline

#2390 2012-12-30 18:45:44

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1690 (both parts) is correct. Excellent!

#1691. If tan A =

, find the value of tan A/(1 + tan[sup]2[/sup]A).


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2391 2012-12-31 02:35:40

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Offline

#2392 2012-12-31 18:45:50

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1691 is correct. Good work!

#1692. Evaluate : (cos 45[sup]o[/sup])/(sec 30[sup]o[/sup] + cosec 30[sup]o[/sup])


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2393 2013-01-01 01:53:09

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Offline

#2394 2013-01-01 19:00:23

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi bobbym,

The solution #1692 is perfect. Excellent!

#1693. If

, then find the value of cot A.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2395 2013-01-01 23:39:24

scientia
Member
Registered: 2009-11-13
Posts: 224

Re: Oral puzzles

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#2396 2013-01-02 03:33:37

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Offline

#2397 2013-01-02 19:21:22

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi scientia and bobbym,

The solution #1693 is correct. Neat work!

#1694. Find the value of cot[sup]2[/sup] θ - 1/sin[sup]2[/sup] θ.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#2398 2013-01-02 23:07:47

scientia
Member
Registered: 2009-11-13
Posts: 224

Re: Oral puzzles

Last edited by scientia (2013-01-02 23:08:25)

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#2399 2013-01-03 02:24:30

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 105,268

Re: Oral puzzles

Hi ganesh;


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
No great discovery was ever made without a bold guess.

Offline

#2400 2013-01-03 18:27:26

ganesh
Moderator
Registered: 2005-06-28
Posts: 21,307

Re: Oral puzzles

Hi scientia and bobbym,

The solution #1694 is correct. Neat work!

#1695. If cos θ = 21/29, find the value of (sec θ)/(tan θ - sin θ).


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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