#apache #archlinux #asterisk #centos #debian #gentoo #haskell #kde #kubuntu #lisp #math #mysql #perl #python #ruby-lang #rubyonrails #suse #ubuntu #vim #wikipedia 0 1 2 3 4 5 6 7 8 9
Top Prev 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 Next
#math
<JimDangle> but i was talking about the inverse tangent
<JimDangle> because wouldnt i need to use that to give me the angle
<JimDangle> since i need to find the change in the angle
<Roey> hi
<JimDangle> hi
<Roey> anyone here use Gnuplot? I have a file with two columns which I would like to plot one against the other. What's the syntax for this?
<Roey> hi JimDangle
<srart> arcsec is tan-1 on the calc
<JimDangle> yeah i know
<JimDangle> i wasnt saying that arctan = tan'
<srart> now you lost me.
<JimDangle> lol
<JimDangle> ok
<JimDangle> i have to find the rate of change in the angle
<JimDangle> so i have the angle being tan theta = y/x
<srart> Roey: http://www.duke.edu/~hpgavin/gnuplot.html
<JimDangle> then theta = tan^-1(y/x)
<JimDangle> and theta' = tan^-1 ' (y/x)
<JimDangle> is what i was saying
<JimDangle> more like asking really
<Roey> srart: thank you :)
<JimDangle> so wouldnt the end result be theta' = tan^-1 '(10/x)
<JimDangle> or well 10/30
<srart> d(theata)/dt@h=30, given dh/dt@h=30=3 meter/sec; tan(theata) = h/30 (meters from observer); diff both sides wrt t yields sec^2(teata)*d(theata)/dt = 1/30 * hd/dt then evaluate @ h=30
<JimDangle> damn
<JimDangle> i was way off
<srart> better notation let % = theata
<JimDangle> ok
<srart> d%/dt|h=30 given dh/dt|h=30 == 3 m/sec; (Draw picture)
<JimDangle> well i drew a picture
<srart> see tan% = h/30
<JimDangle> its just a triangle
<JimDangle> right
<srart> diff both sides
<JimDangle> well i just got confused with the %'
<JimDangle> since its the argument to tan
<JimDangle> so i got it out of there via tan^-1, which isnt right
<srart> (tan%)' = sec^2% and (h/30)' = 1/30 dh/dt
<JimDangle> but yeah, that stuff makes sense to me
<srart> sorry (tan%)' = sec^2%(d%/dt) and (h/30)' = 1/30 dh/dt
<JimDangle> 1/30?
<srart> done wrt
<srart> t
<srart> not h
<JimDangle> damn it im still lost
<srart> diff(h) wrt t != 1
<srart> it's 1*dh/dt
<srart> don't feel bad. One of my math teacher coffesed that she ony got like a C on the related rates test when she was going through college.
<srart> it's hard to wrap your head around.
<srart> I pulled out an old text book
Previous Page Next Page