<p>Do I need to know this for the Calculus AB test? </p>
<p>Even if it is not needed, will knowing it help me save time on test day for certain questions?
Euler's method doesn't appear on AB, but would there ever be a case where using it on the AB exam would save time or be easier than another method? I have found instances where using L'Hopital's has actually saved time on limits on AB questions, rather than using messy trig identities.
<p>It’s probably not going to help you, but it’s basically using a differential equation to produce tangent lines that approximate the value of a function a certain distance away from a known point…</p>
<p>~But being able to figure things like this out on your own without seeing beforehand the steps to the actual process is a valuable skill to have in Calculus and the exam–rather than memorizing the process, understanding and being able to produce it :D</p>