Apparently, my blogs are talkaboutable.
For all of you who oh so completely enjoy these and love talking about them, here's a cookie.
Anyway, on subject:
Some people are saying they don't get how to start Substitution, right? Well, let's try to at least get to where you can get SOME points for these.
Let's say you have a simple...ish equation:
1S0 2sinx*times*cosx-x^2dx
So, your u would be sinx
And your du would be the derivative of that: cosx!
So you plug those back into your equation to get:
1S0 2udu-x^2dx
Now, this is where I lose how to explain this. I can do it, I just can't explain it too well on the computer.
After that, you just integrate sing the u/du's, then plug back in the sin and cos, and then solve like normal integration....right?
I have a serious problem when it comes to testing.
I *most of the time* know what to do, but I just can't do it.
I get intimidated and totally freaked out.
For example, the huge derivatives or huge integrating. Does anyone have any tricks on how to work these?
Also, when going over it with friends I understand what to do, I just cannot do it on my own. Does anyone else have this problem? Or if you did and you overcame it, how??
I'm just terrified I'm going to bomb all of my AP practices tests and STILL go on and take the real one and completely FAIL at it =/
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here's the trick
ReplyDeletedon't sike yourself out, it's just a test, it's not your life, i understand why it gets you nervous, but think about it as you're mad you can't do better, but don't get nervous!! that's the worse thing to do! just don't worry you're very smart and you'll do fine!
&& break everything down..always take a derivative, if it doesn't work then take the integral..if not then try to remember some formaulas!
and i have the same problem, i understand it when i'm with everyone and i'm able to grasp it but in class it just zooms over my head...I THINK IT'S BECAUSE IT'S 1ST HOUR! ha!
YOU'LL DO FINE, DON'T FREAK YOURSELF OUT!!
&& even mrs. robinson said that the AP isn't as hard as what we're taking in class!
when taking really long intergrals or derivatives learn to do what i call tunnel vision. tunnel visioning is when you look at one thing in particular and deal with it alone. if you do this when taking big derivatives, for example, you can deal with each part of the steps to taking the derivative and only after you deal with each step will your mind even consider the next step. try not to get ahead of yourself and relax.
ReplyDeleteJust remember for big derivatives it is mostly likely the product rule or the quotient rule. If you know how to do those two you are good. Others might include ln, or e's, but those are pretty simple too. For big integrals it is most probably substitution that freaks you out.. just take it one step at a time and you will be fine. Good luck girl!
ReplyDeleteIn my opinion it really helps to just know the derivative rules really well because then it makes it easier to set up the problem and solve it
ReplyDeletetalkaboutable................and deep breaths!!!!
ReplyDelete