<p>Using the identity provided in the problem,</p>
<p>cos(2*theta) = cos(theta + theta) = cos(theta)^2 - sin(theta)^2</p>
<p>Since cos^2 + sin^2 = 1 and cos(theta)^2 = 1/3 * 1/3 = 1/9,</p>
<p>sin(theta)^2 + 1/9 = 1
sin(theta)^2 = 1 - 1/9 = 8/9</p>
<p>Thus,</p>
<p>cos(2*theta) = cos(theta + theta) = 1/9 - 8/9 = -7/9.</p>
<p>great - now im four down on math.</p>
<p>lol...that's how I feel. I told myself I wouldn't go on here after the test, but I guess I couldn't help it.</p>
<p>um why do you guys make it so complicated. just do inverse cos 1/3 to find the angle. then times the angle by 2. and finally do cos of 2theta.</p>
<p>and the answer is -7/9</p>
<p>yeah, I guess you could do that too lol</p>
<p>haha, we're obsessing. i am going to stop reading this or i am just going to become upset haha. i missed quite a few things that i shouldnt have missed! </p>
<p>dammit!</p>
<p>Not that bad on the whole... I'm predicting a 33 for myself (I got a 32 in April).</p>
<p>English-REALLY easy
Math- not too bad, but I know I got at least 5-6 wrong
Reading- kinda tricky, but not that bad
Science- INCREDIBLY easy
Essay- easy, except I'm probably gonna get a zero for illegibility.</p>
<p>WOAH !! 446 posts in less than 24 HRS ! :eek:</p>
<p>thanks everyone for posting their valuable feedback !
i had taken the SAT twice and took ACT hoping this will be easier(as every1 said)......but found this a LOT harder ! </p>
<p>may be the questions were easier than SAT, but the TIME limit was really inadequate !</p>
<p>lets hope atleast for a decent score ;)</p>
<p>Oh now i recognize you; you are from Amity, right? Nice to see you here!</p>
<p>Hmmm I think I put -7/9... that was one of the ones I just randomly bubbled with a minute left, but I thiiiiink that's what I put. I tried to look quickly so I could see if somehow miraculously I guessed right. Doesn't matter, not gunna make up for all the others I guessed on. =P</p>
<p>iamnervous, I don't remember the other choices, I put the environment one. </p>
<p>I just read through WAY too many pages of this... I really just have to stop thinking about it and wait til the scores come out.</p>
<p>or you could do 2cos^2x-1=2/9-9/9=-7/9</p>
<p>for the rectangle question, the question never specified that the figure was truly a rectangle though. You were just given a picture of a rectangle. But the two triangles (the left and right ones) were congruent because they had two of the same corresponding sides. </p>
<p>I put that the two angles in between the two triangles were not equal because the figure was not necessarily a rectangle. In other words, the sides of the triangles were not necessarily the diagonals of the rectangle, because it never stated the figure was a rectangle!</p>
<p>Do you guys remember the question about the six digit code and the letters and numbers? I put 1<em>26</em>26<em>10</em>10*10
It said that letters and numbers could be repeated and the first thing was always an eight or something. Can anyone varify my answer?</p>
<p>i'm pretty sure that's correct, inguyen.</p>
<p>um no it's not</p>
<p>the numbers 0-9 and letters A-Z could be repeated, and there's only one choice for the first digit which has to be 8</p>
<p>inguyen is right</p>
<p>That's what I put. All could be repeated, only 1 choice for the first.</p>
<p>shobhit: i said "correct", not "incorrect" :)</p>
<p>lol whoops my bad i just saw that ;), for some reason i saw "correct" and "inguyen" as "incorrect" :P</p>
<p>the one with the circle and the triangle...was that "not enough info"?</p>
<p>no, there was enough info, aka you can use power of point to prove it was a 30,60,90 triangle, so the answer was 120 degrees.</p>
<p>in other words, (7\sqrt{3})^2=(7+2r)(7)--->r=7, so it's a 30,60,90 triangle</p>