член: Melody

921 Questions
34316 Answers

1742

+118732

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
прочитайте больше ..

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Melody 2 апр. 2022 г.

-8

610

+118732

Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. прочитайте больше ..

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Melody 16 мар. 2022 г.

-2

1481

+118732

How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside прочитайте больше ..

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Melody 15 мар. 2022 г.

-3

873

+118732

HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

прочитайте больше ..

Не по теме

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Melody 13 мар. 2022 г.

-4

850

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WELCOME BACK CPHILL !

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Melody 11 февр. 2022 г.

-5

719

+118732

Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. прочитайте больше ..

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Melody 1 февр. 2022 г.

-7

888

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do прочитайте больше ..

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Melody 9 янв. 2022 г.

-6

998

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HAPPY BIRTHDAY CHRIS!

прочитайте больше ..

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Melody 20 дек. 2021 г.

5574

+118732

Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer прочитайте больше ..

Не по теме

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Melody 4 нояб. 2021 г.

-9

1093

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

Не по теме

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Melody 29 окт. 2021 г.

+118732

I'm sure I already answered that question.

Melody31 янв. 2014 г.

+118732

Maranduhh:
what are all the points equidistant away from the center point of a circle called?

umm The circumference?

Melody31 янв. 2014 г.

+118732

tjd:
(1-(sin^2)x)/(cot^2)x=

hi tdk
I think that you have a bracket in a funny spot.
Before do any thing else I am going to show you how to use the sup button that is located above the smilies.
sup stands for superscript.

Write sin then hit the sup button. the curser will go exactly where it wants you to enter 2 then just click to the end of the function and keep going.
so your question is

( 1- sin ²x ) / cot ²x

What is this bit 1- sin ²x ?
Maybe it has got some thing to do with
sin ²x + cos ²x = 1 ?

What about cot x.
isn't cot x = 1/tanx ?
And, when you divide isn't that the same as multiplying by the reciprocal?

That's enough hints.
You see if you can do it.

Melody31 янв. 2014 г.

+118732

Rom:
Is there a help file somewhere on how to use the forum tools to get a decent math output display?

Does this board support LaTex?

hi Rom,

No no Latex here
There are the few buttons at the top above the smilies.
I have been pushing really hard for everyone to use the sup and sub buttons. Especially the sup button
I'd really like you to give individual lessons to everyone who is not using them.
I actually don't know what some of the other buttons do.
Reinout-g did a couple of posts about them yesterday. I bumped them up so that they are located just after my last night's wrap. You want to take a look. I havn't digested them yet.

I sometimes write latex programs in Texmaker and then snip the output and post it in here. I suppose it is a bit of a hastle but it doesn't take that long when you get used to it.
Plus attachments are displayed much better here than they are in MHF.
I also use GeoGebra in the same way. Are you familiar with that program? It uses Latex in its ouput as well.

By the way, it is really nice to see you here. I laughed my head off when I realized who you were.
Keep Smiling
Melody.

Melody31 янв. 2014 г.

+118732

machapungo:
what is 1 times 10 to the 30th Hz divided by 299792458 meters per second ?

Herzt is cycles/second
so
cycles/sec divided by metres/sec
=(cycles/sec) x (sec/metres) the seconds cancel out so you are left with
=cycles/metre

1 times 10 to the 30th Hz divided by 299792458
=10 ³⁰ / 299792458 cycles/metre
= 3.3 x 10 ²¹ cycles/metre Correct to 2 significant figures

Melody31 янв. 2014 г.

+118732

My goodness, we have to be quick today!

Melody31 янв. 2014 г.

#11

+118732

Melody:

5(a+4)=6-(a-9)

Hi Anonymous 4334,
If this was a question that someone was asking me I would put in a real lot of steps to make it easier to follow.
However, if I was doing it for myself this is what I would do.

5(a+4)=6-(a-9)
5a+20 =6-a+9
5a+20 = 15-a
6a+20=15
6a=-5
a=-5/6

Maybe I should check that you understand, the minus sign always belongs to the thing behind it. And, if there is nothing between a minus sign and a bracket, there is really an invisible one.
so I will do the RHS (right hand side) really slowly.
6-(a-9)
= 6 - 1(a-9)
= 6+ -1(a-9)
= 6+ (-1*a) +(-1*-9)
= 6+-a++9
= 6-a+9
= 6+9-a
= 15-a

And, on paper I would line up all the equal signs (underneath each other)
Do you understand all that.
Don't do the next one unless you completly understand the first one.

Do you want to try another one?
1-5(x+3)= -(x+17) - 2(6-x)

Melody31 янв. 2014 г.

+118732

bump

Melody30 янв. 2014 г.

+118732

Hi Anonymous 4338,
I am wondering why you haven't done this.
I am assuming that either you just don't want to, which is absolutely fine.
or
you don't know how to lay it out properly. If this is the case I can help you learn.
Setting out is very important in maths and it can make things much easier.
Melody.

Melody30 янв. 2014 г.

#26

+118732

bump

Melody30 янв. 2014 г.

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