To be fair to Sage they have a more beginner friendly tutorial for solving differential equations: <a href="http:&#x2F;&#x2F;doc.sagemath.org&#x2F;html&#x2F;en&#x2F;tutorial&#x2F;tour_algebra.html#solving-differential-equations" rel="nofollow">http:&#x2F;&#x2F;doc.sagemath.org&#x2F;html&#x2F;en&#x2F;tutorial&#x2F;tour_algebra.html#s...</a>