Uni Stuff > Mathematics
Maths Questions ^_^
Collin Li:
--- Quote from: Odette on April 24, 2008, 10:50:25 pm ---ahh thanks ! i didnt know 1 + tan ^2 x = sec ^2 x (i'm new to this lolz)
--- End quote ---
It comes from , and dividing both sides by . :)
--- Quote from: Odette on April 24, 2008, 10:50:25 pm ---Oh another question i was a little confused about:
sin ( pi/2 - x) [secx - cosx]
P.S i dont know how to use latex or whatever its called.
--- End quote ---
You can simplify into . This can be shown geometrically by drawing any right-angled triangle with an angle . The other angle must be , since a triangle has angles adding up to . I've only briefly outlined this, so if you don't get it, ask about it.
This should now yield:
LaTeX is pretty straightforward. Here are some links, give it a go - you learn best by experimenting:
http://vcenotes.com/forum/index.php/topic,864.0.html
http://www.artofproblemsolving.com/LaTeX/AoPS_L_GuideSym.php
Odette:
Ah does that have anything to do with the sine and cosine graphs being similar except one is moved to the right pi/2 units? (i dunno something the lecturer mentioned today)
And thanks again ^_^ I appreciate it
Collin Li:
--- Quote from: Odette on April 24, 2008, 11:18:23 pm ---Ah does that have anything to do with the sine and cosine graphs being similar except one is moved to the right pi/2 units? (i dunno something the lecturer mentioned today)
--- End quote ---
Yeah, that's another way you can think of it. You should try the right-angled triangle method though, it's rather nice.
Odette:
--- Quote from: coblin on April 24, 2008, 11:21:31 pm ---
--- Quote from: Odette on April 24, 2008, 11:18:23 pm ---Ah does that have anything to do with the sine and cosine graphs being similar except one is moved to the right pi/2 units? (i dunno something the lecturer mentioned today)
--- End quote ---
Yeah, that's another way you can think of it. You should try the right-angled triangle method though, it's rather nice.
--- End quote ---
Ok, um any link for that one? I've never heard of that method, so i'm not too sure what you're talking about.
Odette:
Ah never mind i did some research and found out what you were talking about :)
Thanks again coblin =) it's pretty straight forward now. Oh and i'll practice using LaTeX from now on :)
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version