Parametric Equations 3

NeoXC Says:

Dec 13, 2010 - You're a life saver, Sal! My professor in my calc 2 class went over an example one day.. He had spent about 10 minutes doing an example with trig involved, then brushed over it. Never really saw much in my book involving parameterizing trig parametric equations. ...And all of a sudden, BAM, first question on the exam is this. I got half right (did cos(arcsint)). 2 months pass and it's showing up again on a final exam review sheet. Found this video and suddenly I understand within 5 minutes!

Victorisbored Says:

Jan 1, 2011 - good video but i have a quick question can you solve x= 3sinty= 4cost + 2 what conic section is it?

wasdtomove924 Says:

Feb 11, 2011 - in a problem like x = 2 sin ^2(t) and y = 3 cos ^2 (t) can you use the trig identity to make it x/2 + x/3 = 1? to make it into an ellipse because i checked the back of my book for the graph and it was a line

diffusiventity Says:

Mar 20, 2011 - Wonderfully explained

deathalert Says:

Apr 11, 2011 - Aiii luvz khanacademy. Helpt mi wit maii math

anantnaik12 Says:

Jul 20, 2011 - and your spelling..

MrVargasesteban Says:

Aug 23, 2011 - i feel weird with the ''arc sin''but great channel

garrett92895 Says:

Sep 7, 2011 - @wasdtomove924 it's a line because it ends up being x/2+y/3=1 for it to be an ellipse it would have to be x^2 /2 + y^2 /3 = 1

Kaminoeiennohigan Says:

Dec 17, 2011 - takes too long to get to the effing POINT.

MilitaryMan006 Says:

Dec 22, 2011 - just be patient

mellowmorgan92 Says:

Jan 12, 2012 - My mind tends to wander during lectures, as it does on these videos. But on youtube, I can rewind!

alitou001 Says:

Feb 17, 2012 - before they had no youtube but they hadless distractions,now we have youtube but a lot of distractions (facebook,xbox,psp,apple apps.....) .

wewentswimmin223 Says:

Mar 6, 2012 - I'm going to always "mildly pat my back" lol :)

Cptniiii Says:

Mar 13, 2012 - "I'm using this blue color a little too much. It's getting monotonous."BLUE CAN NEVER BE MONOTONOUS.

themin91 Says:

Mar 15, 2012 - in 12:12 what did you making of?

smitrib Says:

Mar 24, 2012 - Oh yes, Sal, I did enjoy that ;)

jmatia100 Says:

Mar 27, 2012 - I almost feel bad for the people who paid to learn this in college when the course was offered in High School for free

InSingularity Says:

Apr 4, 2012 - I'm learning this in high school right now

InSingularity Says:

Apr 4, 2012 - 7:20 it's a football

sendseanziemail Says:

Apr 16, 2012 - though it could get monochromatic...

steave707 Says:

Apr 17, 2012 - Dude.. i love you..

Truwarier14 Says:

Apr 26, 2012 - does this work the same way with theta instead of t?

illiniballin11 Says:

May 15, 2012 - yes

nedsoc Says:

May 24, 2012 - as long as the variable remains constant throughout the problem, it does not matter what it is. (For example, you could have been using any letter other than 'x' for all of your variables thus far in math class)