Warning: Illegal string offset 'html' in /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php on line 909

Tricky equation - rearranging - HSN forum

# Tricky equation - rearranging

10 replies to this topic

### #1herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 15 April 2006 - 09:51 AM

I need this rearranged so that Dmin = whatever.

http://s54.photobucket.com/albums/g96/herb...titledlybob.gif

I can't show you it any other way really.

I shall try to type it out...

n = sin (( A + Dmin ) / 2 )
--------------------------
sin( A / 2 )

Typing out didn't work too well.... it's n equals the top stuff over the bottom stuff.
Signatures suck. They clog up websites and serve no purpose.

### #2The Wedge Effect

HSN Legend

• Members
• 2,477 posts
• Location:Paisley
• Gender:Male

Posted 15 April 2006 - 10:40 AM

Would it be like:

?

Edit: Sorry, for some reason, LaTeX won't render this expression properly.

### #3herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 15 April 2006 - 10:56 AM

Maybe this will clarify...

n equals the following:
sin (( A + Dmin ) / 2 ) ... this is then divided by sin( A / 2 ) . The result is n.
Signatures suck. They clog up websites and serve no purpose.

### #4The Wedge Effect

HSN Legend

• Members
• 2,477 posts
• Location:Paisley
• Gender:Male

Posted 15 April 2006 - 11:25 AM

Ooooh, that is a tricky question. I'll have a look for you and get back to you.

Edit: I get Dmin=nA+A but I don't think it's right. It doesn't look like a Highers question to me.

### #5herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 15 April 2006 - 11:54 AM

I'm seeing the equation you got now... it wasn't done fully on my screen for some reason before. Yeh, that's it.
Signatures suck. They clog up websites and serve no purpose.

### #6Steve

Top of the Class

• 435 posts
• Location:Edinburgh
• Gender:Male

Posted 15 April 2006 - 11:55 AM

I get this:

just by multiplying by then taking inverse sine on both sides.
HSN contribute: Help the site grow!

Looking for a Maths tutor in West Lothian? Just PM me!

### #7herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 15 April 2006 - 11:59 AM

Thanks.

Can someone verify that that is correct please? Quite important that I get this correct.
Signatures suck. They clog up websites and serve no purpose.

### #8dfx

Fully Fledged Genius

• Members
• 1,955 posts
• Gender:Male

Posted 15 April 2006 - 12:47 PM

I'd trust Steve over me lol. Is this for a physics investigation by any chance? Looks like the angle of deviation for prisms.

### #9herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 15 April 2006 - 12:54 PM

Yeh, but it should be do-able with higher maths knowledge. Unfortunately, I did it a year ago, so I'm not gonna be able to do this kinda stuff with any ease at all.
Signatures suck. They clog up websites and serve no purpose.

### #10George

Child Prodigy

• 720 posts
• Location:West Lothian
• Gender:Male

Posted 16 April 2006 - 11:43 AM

I agree with what Steve said - it's not a very nice expression, but if you substitute it into the original expression, you'll find that it works.

Maple (a computer algebra package) also gives that as the answer

### #11herbeey

Site Swot

• Members
• 161 posts
• Gender:Male

Posted 16 April 2006 - 12:09 PM

Cool! Thanks people!
Signatures suck. They clog up websites and serve no purpose.

#### 1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users