<p>For #1 I’m getting 13.061</p>
<p>@hellohellicopter
The length of the path described by the parametric equations x=2sint and y=3cost for 0<t<pi/2 is given by?</p>
<p>it is the defint from 0 to pi/2 of the sqrt of ((dy/dt)^2 + (dx/dt)^2). Or, in this case, ((-3sint)^2+(2cost)^2)). I am getting 3.9663597</p>
<p>Because are of a circle is (diameter)^2 (pi/4), you take 1/2 x pi/4 = pi/8</p>
<p>@lemone: HUH!?! area of a circle is pi<em>r^2. area of a semicircle (pi</em>r^2)/2. Can someone else explain why lemone is using a diff. formula?</p>
<p>Thank you, xxLAJxx! I think my prep book is wrong… nice one. :/</p>
<p>and, when you are doing CROSS SECTIONS, then you multiply by pi/8 for a semi circle, and pi/4 for a half circle. it is the pi/8 * the integral from a to b of the function squared. Is that what you’re asking?</p>
<p>Hey guys, what review books are you using? Any good ones?</p>
<p>the practice tests in PR seem really easy, is barrons any good?</p>
<p>I’m using princeton review… I also have one that came with my textbook, I’m doing the exam in there currently. 
It’s made by Pearson, I think. I think I’ve heard Barrons is pretty good, as well.</p>
<p>Barron has too many topics I have not covered…like Talyor series for tanx and stuff…lol</p>
<p>I am using Peterson’s and some old exams with PR</p>
<p>oh AND what do you guys think the FRQs will be on this year…???</p>
<p>im pretty sure they will probs be a power series rather than a taylor series (since its been on the last two years.)
Also might be a lagrange error bound since that hasnt been on a while
and most likely a polar question</p>
<p>mainly easy stuff.</p>
<p>My question was, which test book is the most ACCURATE to predict your score for the actual ap exam</p>
<p>Probably at least one question on volumes, parametric/vector stuff (they might pull out a polar stuff for fun…), definitely something on rates, and yeah…</p>
<p>God damn it, I hate those damn polar stuff. And you thought parametric sucked, please do not bring those polar stuff back</p>
<p>AH I hate polar as well! It’s so hard… when you say rates, do you mean something along the lines of eulers and a slope field, or related rates?</p>
<p>No differentials = slopefields, euler’s method and such</p>
<p>rates = it’s one of those weird word questions about water flowing in a pipe, people entering a building at a rate of etc…</p>
<p>hey wait, they had a polar question last year for form b 2009, hmmmm lol</p>
<p>well maybe for form A?? idk lol
anyway, the only thing that ****es me off is vector/parametric questions (not the MC questions but the FRQ’s) and maybe the LaGrange error questions but the rest is not too bad.</p>
<p>I actually find some of the old multiple chocie questions more difficult than some of the freeresponse questions.</p>
<p>^^
laGrange bound errors will be the death of me. i ALWAYS forget how to do them. i understand it for 10 minutes and then i forget again wth.
I’m hoping for three area questions in the FRQ. like that’s possible lol
and i’m screwed if it comes to polar…</p>
<p>^2 weeks ago, i had no idea what the **** they were lol, basically it is just the last term you are evaluating.</p>
<p>In the xy-plane, the line x+y=k, where k is a constant, is tangent to the graph of y= x^2+3x+1. What is the value of k?</p>
<p>a. -3
b. -2
c. -1
d. 0
e. 1</p>