let a, b be Real; :: thesis: for A being closed-interval Subset of REAL
for f, f1 being PartFunc of REAL ,REAL
for Z being open Subset of REAL st A c= Z & ( for x being Real st x in Z holds
( f . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) & f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) ) & Z c= dom (arcsin * f1) & Z = dom f & f | A is continuous holds
integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A))
let A be closed-interval Subset of REAL ; :: thesis: for f, f1 being PartFunc of REAL ,REAL
for Z being open Subset of REAL st A c= Z & ( for x being Real st x in Z holds
( f . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) & f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) ) & Z c= dom (arcsin * f1) & Z = dom f & f | A is continuous holds
integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A))
let f, f1 be PartFunc of REAL ,REAL ; :: thesis: for Z being open Subset of REAL st A c= Z & ( for x being Real st x in Z holds
( f . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) & f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) ) & Z c= dom (arcsin * f1) & Z = dom f & f | A is continuous holds
integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A))
let Z be open Subset of REAL ; :: thesis: ( A c= Z & ( for x being Real st x in Z holds
( f . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) & f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) ) & Z c= dom (arcsin * f1) & Z = dom f & f | A is continuous implies integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A)) )
assume A1: ( A c= Z & ( for x being Real st x in Z holds
( f . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) & f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) ) & Z c= dom (arcsin * f1) & Z = dom f & f | A is continuous ) ; :: thesis: integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A))
then A2: ( f is_integrable_on A & f | A is bounded ) by INTEGRA5:10, INTEGRA5:11;
A3: for x being Real st x in Z holds
( f1 . x = (a * x) + b & f1 . x > - 1 & f1 . x < 1 ) by A1;
A4: arcsin * f1 is_differentiable_on Z by A1, A3, FDIFF_7:14;
A5: for x being Real st x in dom ((arcsin * f1) `| Z) holds
((arcsin * f1) `| Z) . x = f . x

proof

let x be Real; :: thesis: ( x in dom ((arcsin * f1) `| Z) implies ((arcsin * f1) `| Z) . x = f . x )
assume x in dom ((arcsin * f1) `| Z) ; :: thesis: ((arcsin * f1) `| Z) . x = f . x
then A6: x in Z by A4, FDIFF_1:def 8;
then ((arcsin * f1) `| Z) . x = a / (sqrt (1 - (((a * x) + b) ^2 ))) by A1, A3, FDIFF_7:14
.= f . x by A1, A6 ;
hence ((arcsin * f1) `| Z) . x = f . x ; :: thesis: verum

end;

dom ((arcsin * f1) `| Z) = dom f by A1, A4, FDIFF_1:def 8;
then (arcsin * f1) `| Z = f by A5, PARTFUN1:34;
hence integral f,A = ((arcsin * f1) . (sup A)) - ((arcsin * f1) . (inf A)) by A1, A2, A4, INTEGRA5:13; :: thesis: verum