<p>So Barron's famed for super hard questions. Throw them at me! Calculus</p>
<p>e-books are illegal when not purchased from a legitimate vendor. I can throw you some nasty calc problems though, if that’s alright with you ;)</p>
<p>∫ (x - 1) / sqrt(x^2 + 2x) dx, Even though this isn’t from barrron’s it would be nice to try. :)</p>
<p>u = x^2 + 2x</p>
<p>du/dx = 2x + 2</p>
<p>du/dx = 2(x + 1)</p>
<p>du/2(x + 1) = dx</p>
<p>0.5∫ du/sqrt(u)</p>
<p>um, how do you get rid of the (x+1) term? The top of the integral has (x-1) (not plus).</p>