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

You are not logged in.

- Topics: Active | Unanswered

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi ganesh;

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi bobbym,

The solution #1685 is correct. Good work!

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

Character is who you are when no one is looking.

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,813
- Website

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

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi;

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

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 14,847

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi,

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

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

Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi;

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

Offline

**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,813
- Website

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.

"Double the fun, double the thrill, double the coolness" - Julianthewiki

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi bobbym and julianthemath,

The solution #1687 is

Excellent, bobbym!

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

Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi bobbym,

The solution #1688 is perfect. Smart work!

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

Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi ganesh;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi bobbym,

The solution #1689 is correct. Good work!

#1690. If

, find cos θ and tan θ.Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

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).Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

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])

Character is who you are when no one is looking.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi ganesh;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

Hi bobbym,

The solution #1692 is perfect. Excellent!

#1693. If

, then find the value of cot A.Character is who you are when no one is looking.

Offline

**scientia****Member**- Registered: 2009-11-13
- Posts: 222

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi ganesh;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

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.

Character is who you are when no one is looking.

Offline

**scientia****Member**- Registered: 2009-11-13
- Posts: 222

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,752

Hi ganesh;

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 12,964

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).

Character is who you are when no one is looking.

Offline