diff ( y , x , 1 ) = arccos(0.1 * x + 0.2) ; ! max_terms := 30; Digits := 32; ! x_start := -0.8; x_end := 0.8 ; diff(y,0,exact_soln_y(x_start)); glob_look_poles := true; glob_max_iter := 100; ! exact_soln_y := proc(x) return(10.0 * (0.1 * x + 0.2) * arccos(0.1 * x + 0.2 ) - 10.0 * sqrt(1.0 - expt((0.1 * x + 0.2) , 2 ))); end;