Hi it's me again,
Here is my situation. I dropped out of calculus because I had problems with algebra. I had taken it and trig over two years ago with a crummy teacher blah blah etc. So I retook college algebra for a refresher. Now I feel pretty confident in my algebra skills. I was the same with trig as well until I found Khan Academy.
My question is this: Is the Trigonomety playlist from khanacademy.org sufficient to get me through calculus?
http://www.khanacademy.org/#trigonometry
Assuming that I understand all of it. I've watched up to the "Fun Trig Problem" video and have understood it all. I love khanacademy, best thing since indoor plumbing.
Edit: A second question: Is Khan thorough enough on all the math playlists? From what I've seen in the algebra section he is.
Is Khan Academy enough? Trig for Calculus
Moderators: gmalivuk, Moderators General, Prelates

 Posts: 12
 Joined: Sun Jan 23, 2011 2:13 am UTC
Re: Is Khan Academy enough? Trig for Calculus
Probably. No reason you can't go through the Khan Academy's calculus lessons and see for yourself.
Re: Is Khan Academy enough? Trig for Calculus
In my opinion what you need trigwise for calculus is to be familiar enough with it that when you see it you don't freak out and think it's hard. When you see it you need to think "Oh right trig stuff. I can do that."
That being said the other things you should "know" are:
What the graphs of the trig functions look like and what their values are at multiples of pi/6 and pi/4 (so in degrees, 0,30,45,60,90 etc)
The "definitions" of the trig functions.
You should know that trig identities exist and have some idea of what they look like.
For completeness I'll mention the law or sines and the law of cosines... but their use will vary greatly depending on your calc class. Some classes will use them lots... others sparsely and still others not at all.
By the way I like Kahn academy. Especially for people that took a course a few years ago, and have forgotten half of it, and are rusty on most of the rest of it. These people aren't ready to take the next class but its a waste of time to retake the whole class. Kahn academy allows those students to relearn the 1 or 2 (or 3,4 or 5) specific topics they need help on in a few days or weeks, instead of having to sludge through a whole 16 week course to pick up the 8 days worth of material you can't remember.
That being said the other things you should "know" are:
What the graphs of the trig functions look like and what their values are at multiples of pi/6 and pi/4 (so in degrees, 0,30,45,60,90 etc)
Spoiler:
The "definitions" of the trig functions.
Spoiler:
You should know that trig identities exist and have some idea of what they look like.
Spoiler:
For completeness I'll mention the law or sines and the law of cosines... but their use will vary greatly depending on your calc class. Some classes will use them lots... others sparsely and still others not at all.
Spoiler:
By the way I like Kahn academy. Especially for people that took a course a few years ago, and have forgotten half of it, and are rusty on most of the rest of it. These people aren't ready to take the next class but its a waste of time to retake the whole class. Kahn academy allows those students to relearn the 1 or 2 (or 3,4 or 5) specific topics they need help on in a few days or weeks, instead of having to sludge through a whole 16 week course to pick up the 8 days worth of material you can't remember.

 Posts: 12
 Joined: Sun Jan 23, 2011 2:13 am UTC
Re: Is Khan Academy enough? Trig for Calculus
And you also need to know how to rewrite all the other trig functions in terms of quotients of sines and cosines (and/or the number one).
Now that I haven't covered yet. I'm assuming it's just simple memorization though.
Thank you. That was exactly what I was looking for. I wish I had known about Khan back when I had trouble with algebra.
Edit: Oh and FYI, there is a fundraiser for Khan going on right now here:http://www.crowdrise.com/Khanacademyproject/fundraiser/WIRED
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