diff ( y , x , 1 ) = arcsin ( x ) ; ! max_terms := 30; Digits := 32; ! x_start := -0.8; x_end := 0.8 ; array_y_init[1] := exact_soln_y(x_start); glob_h := 0.00001 ; glob_look_poles := true; glob_max_iter := 100; ! exact_soln_y := proc(x) x*arcsin(x)+sqrt(1.0-x*x); end;