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 06-04-2011, 11:41 AM #1 New Member   Join Date: Oct 2010 Posts: 5 Official Math IIC Discussion Post-Exam the similar triangles problem...? ...tan(y) the 0 sin(theta), cos(theta)>cos(2theta), tan(theta)>sin(theta)...? problem asking for f(x) symmetric about the y-axis..what is true... f(x)=f(-x) Reply
 06-04-2011, 12:58 PM #2 Junior Member   Join Date: Sep 2010 Location: Taco Bell Posts: 172 1. I put the same for the similar triangles (guessed lol) 2. uhh it was II and III, if you graph the first one you see that around pi/2 sin(theta) becomes larger 3. Yup Reply
 06-04-2011, 12:59 PM #3 Junior Member   Join Date: Sep 2010 Location: Taco Bell Posts: 172 would skipping 4 and missing maybe.... let's say.. 5 be a 740? (going with the barron's and collegeboard scoring, but this test seemed easier than the two so I'm kind of worried..) Reply
 06-04-2011, 01:20 PM #4 Senior Member   Join Date: Jan 2010 Location: NY -> Rensselaer '16 Posts: 4,530 It was just II. If you graphed the equation for III, the equations were the same until about .08, which contradicts the assertion. Reply
 06-04-2011, 02:43 PM #5 New Member   Join Date: Jan 2011 Location: São Paulo, Brazil Posts: 28 left 5 blank... =P couldn't find the answer for the right circular cylinder with height 4... I calculated it 5 times and none of my answers would match those given... Just wanted to kill myself! The similar triangles were kinda easy... The trig. one about which assertions were true was harsh... I think I put II and III, but I might be mistaken =P @Mcken171: you've got the y-axis symmetry one right! =D So do you guys think there are any chances for an 800 here? Left 5 blank and the rest was thoroughly done, without any guessing... Reply
 06-04-2011, 05:52 PM #6 New Member   Join Date: Mar 2011 Posts: 7 I did the right circular cylinder problems wrong the first time. I was plugging them into the cone equation. When I went back to them I corrected it and both answers were there. Maybe that's what you did? The equation you needed did NOT have 1/3 in it. Reply
 06-04-2011, 05:54 PM #7 Junior Member   Join Date: May 2011 Posts: 166 how come i plugged those into my TI-89 and i got @ = theta ok? sin(2@) - sin(@) >0, so i assumed yes, sin(2@) is greater than sin(@) cos(2@) - cos(@) <0, so i assumed yes, cos(2@) is less than cos(@) and for tan i got a lot of split intervals, so i put that as false. as in it switched around greater than and less than during the interval x<@
 06-04-2011, 07:24 PM #8 Junior Member   Join Date: May 2011 Posts: 42 confirmed my answer with my friend and got II and III when plugging in pi/3 as theta in the domain. I orginally got I II and III when plugging in pi/4 because that was the middle of the domain and a bad number, changed it to pi/3 and got II and III Reply
 06-04-2011, 07:25 PM #9 Junior Member   Join Date: May 2011 Posts: 42 Anybody think math IIC was so hard? I took practice tests in the barrons usually getting 10-12 wrong and answering everything, but for this test i left 3 blank cause had no idea how to do it and ran out of time Reply

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