Learning Guide Learning Guide

220 • Chapter 6: Examples from Calculus> sol := sol union { % };sol := {2.180293062, π}The following is the set of extremal errors at the ξ = x boundary.> { seq( B, x=sol ) };{0, 0.04005698601 (2.180293062 − π) 6 }Now enlarge the set of large errors.> critical := critical union %;critical := {0, −0.01542298119 (4 − π) 6 ,0.04005698601 (2.180293062 − π) 6 ,0.07333000221 (2 − π) 6 }Finally, you must add the error at the four corners to the set of criticalvalues.> critical := critical union> { eval( err, {xi=2, x=2} ),> eval( err, {xi=2, x=4} ),> eval( err, {xi=4, x=2} ),> eval( err, {xi=4, x=4} ) };