<p>@jrp oh haha my bad. ln(sinx)=0, lnx= .45 is what im getting now, i think it was what i put on the test</p>
<p>crap! i just realized why, my calculator rounds numbers to the nearest tenth. UGHHHHHHH</p>
<p>The curve is ~-6 or -7 According to Barron’s</p>
<p>@cortana - Yeah, for tanx>sinx, tanx=sinx/cosx and cos x is always less than one between 0 and pi/2, so tanx must be larger.</p>
<p>so far i have 2 wrong. if i don’t get more than 4 wrong than i definitely have an 800</p>
<p>For the tanx>sinx one…</p>
<p>Remember that tanx is defined as sinx/cosx. On the interval 0<x<pi/2, sin is increasing from 0 to 1, as cos is decreasing from 1 to 0. </p>
<p>Between 0 and pi/2, cos is ALWAYS less than 1 and greater than zero. So sin(x)/cos(x) will always be greater than sin(x). Thus, tan(x)>sin(x)</p>
<p>did anyone take this test last year and this year and think this year’s was harder/easier?</p>
<p>@cortana I initially thought it was only II since the calculator displays them as equal when x becomes very small…but I’m pretty sure they don’t equal each other no matter how close to zero x gets, it’s just that the calculator can only display up to a certain degree of accuracy</p>
<p>That was a fairly simple test. I skipped a couple due to time constraints, but I might actually pull an 800. At the very least, I got a 760. They didn’t put any of the hard topics on this test though, so I bet the curve’s going to be fairly harsh.</p>
<p>but tan(0) = sin(0)</p>
<p>I agree with supergenericman. There were no series or counting problems.</p>
<p>I swear that I had a binomial sequence question, and I’m 99.9% sure there was a general series question as well.</p>
<p>@ninjafro i remember that one. I got y^2 for that one. Pretty sure it’s right</p>
<p>@cortana i agree</p>
<p>@grojos haha it’s fine. ln x can’t be .45 because then x would be like 1.568, and so sinx would be like .027…
idk I don’t think that comes out to “0”</p>
<p>Well…let me rephrase that. There were no HARD series questions. I thought everything on the test was relatively easy compared to practice tests I took.</p>
<p>There was one where you had to find the closest answer, where you have to find the number of hours for a bacteria to go from 1 to 5 million if it doubled every hour, so there was a geometric series question. I remember because I hated how they worded the question/answers.</p>
<p>Tan(0) is indeed equal to sin(0)</p>
<p>But the interval was 0<x<pi/2; 0 was not included, and neither was pi/2.</p>
<p>ln(sinx)=0 on a graph gives (1.57, 0), then you do ln1.57</p>
<p>and sin1.57 = 1</p>
<p>@jrp</p>
<p>I assumed it was in radians</p>
<p>ln(sinx) = 0</p>
<p>e^ln(sinx) = e^0</p>
<p>sinx = 1
x = pi/2</p>
<p>ln(pi/2) = .42ish</p>