let n be Element of NAT ; :: thesis: for A being non empty closed_interval Subset of REAL st n <> 0 holds
integral (((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))),A) = ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (upper_bound A)) - ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (lower_bound A))
let A be non empty closed_interval Subset of REAL; :: thesis: ( n <> 0 implies integral (((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))),A) = ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (upper_bound A)) - ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (lower_bound A)) )
assume A1: n <> 0 ; :: thesis: integral (((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))),A) = ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (upper_bound A)) - ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (lower_bound A))
A2: for x being Real st x in REAL holds
(AffineMap (n,0)) . x = n * x

proof

let x be Real; :: thesis: ( x in REAL implies (AffineMap (n,0)) . x = n * x )
assume x in REAL ; :: thesis: (AffineMap (n,0)) . x = n * x
(AffineMap (n,0)) . x = (n * x) + 0 by FCONT_1:def 4
.= n * x ;
hence (AffineMap (n,0)) . x = n * x ; :: thesis: verum

end;

A3: dom (sin * (AffineMap (n,0))) = [#] REAL by FUNCT_2:def 1;
A4: for x being Real st x in REAL holds
(AffineMap (1,0)) . x = x

proof

let x be Real; :: thesis: ( x in REAL implies (AffineMap (1,0)) . x = x )
assume x in REAL ; :: thesis: (AffineMap (1,0)) . x = x
(AffineMap (1,0)) . x = (1 * x) + 0 by FCONT_1:def 4
.= x ;
hence (AffineMap (1,0)) . x = x ; :: thesis: verum

end;

A5: for x being Element of REAL st x in dom ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) holds
((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) . x = ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) . x

proof

let x be Element of REAL ; :: thesis: ( x in dom ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) implies ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) . x = ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) . x )
assume x in dom ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) ; :: thesis: ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) . x = ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) . x
((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) . x = x * (sin . (n * x)) by A1, Th8
.= x * (sin . ((AffineMap (n,0)) . x)) by A2
.= x * ((sin * (AffineMap (n,0))) . x) by A3, FUNCT_1:12
.= ((AffineMap (1,0)) . x) * ((sin * (AffineMap (n,0))) . x) by A4
.= ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) . x by VALUED_1:5 ;
hence ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) . x = ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) . x ; :: thesis: verum

end;

A6: dom ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) = [#] REAL by FUNCT_2:def 1;
((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0)))) is_differentiable_on REAL by A1, Th8;
then dom ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL) = dom ((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) by A6, FDIFF_1:def 7;
then A7: (((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) `| REAL = (AffineMap (1,0)) (#) (sin * (AffineMap (n,0))) by A5, PARTFUN1:5;
((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) | A is continuous ;
then A8: (AffineMap (1,0)) (#) (sin * (AffineMap (n,0))) is_integrable_on A by A6, INTEGRA5:11;
((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))) | A is bounded by A6, INTEGRA5:10;
hence integral (((AffineMap (1,0)) (#) (sin * (AffineMap (n,0)))),A) = ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (upper_bound A)) - ((((1 / (n ^2)) (#) (sin * (AffineMap (n,0)))) - ((AffineMap ((1 / n),0)) (#) (cos * (AffineMap (n,0))))) . (lower_bound A)) by A1, A8, A7, Th8, INTEGRA5:13; :: thesis: verum