<p>Can someone tell me if trig substitution, for example int 1/sqrt(4x^2-49) dx, is going to be on the AP Calc BC exam or not? I searched online and some sources said that it isn't required and some said it was. My Calc teacher didn't teach it to us though, so I'm really confused about whether I should spend time learning it or not. I do find it quite difficult. Please help, thanks.</p>
<p>Yes, I’m almost positive trig sub will be on the exam. Bane of my existence 
Paul’s Online Math Notes does a pretty good job of explaining it here: <a href=“http://tutorial.math.lamar.edu/Classes/CalcII/TrigSubstitutions.aspx”>http://tutorial.math.lamar.edu/Classes/CalcII/TrigSubstitutions.aspx</a> but I’m still kind of lost as well. </p>
<p>Best of luck! </p>
<p>thanks a lot! </p>
<p>For what it’s worth, there wasn’t any trig substitution when I took the exam last year.</p>