x = [ 0. 0.25 0.5 0.75 1. 1.25 1.5 1.75 2. 2.25 2.5 2.75
3. 3.25 3.5 3.75 4. ]
true values of y = [1.0, 2.560546875, 3.21875, 3.279296875, 3.0, 2.591796875, 2.21875, 1.998046875, 2.0, 2.248046875, 2.71875, 3.341796875, 4.0, 4.529296875, 4.71875, 4.310546875, 3.0]
y by euler method = [1.0, 3.125, 4.1796875, 4.4921875, 4.34375, 3.96875, 3.5546875, 3.2421875, 3.125, 3.25, 3.6171875, 4.1796875, 4.84375, 5.46875, 5.8671875, 5.8046875, 5.0]
error = [0.0, -22.04424103737605, -29.854368932038835, -36.986301369863014, -44.791666666666664, -53.127354935945739, -60.2112676056338, -62.267839687194524, -56.25, -44.569939183318851, -33.045977011494251, -25.073056691992985, -21.09375, -20.741699008193187, -24.337748344370862, -34.662437698232893, -66.666666666666671]