let A be non empty closed_interval Subset of REAL; :: thesis: for Z being open Subset of REAL st A c= Z holds
integral (((- (id Z)) (#) cos),A) = (((- cos) - ((id Z) (#) sin)) . (upper_bound A)) - (((- cos) - ((id Z) (#) sin)) . (lower_bound A))
let Z be open Subset of REAL; :: thesis: ( A c= Z implies integral (((- (id Z)) (#) cos),A) = (((- cos) - ((id Z) (#) sin)) . (upper_bound A)) - (((- cos) - ((id Z) (#) sin)) . (lower_bound A)) )
assume A1: A c= Z ; :: thesis: integral (((- (id Z)) (#) cos),A) = (((- cos) - ((id Z) (#) sin)) . (upper_bound A)) - (((- cos) - ((id Z) (#) sin)) . (lower_bound A))
A2: cos is_differentiable_on Z by FDIFF_1:26, SIN_COS:67;
A3: (- cos) - ((id Z) (#) sin) is_differentiable_on Z by Th19;
A4: for x being Real st x in Z holds
(- (id Z)) . x = ((- 1) * x) + 0

proof

let x be Real; :: thesis: ( x in Z implies (- (id Z)) . x = ((- 1) * x) + 0 )
assume A5: x in Z ; :: thesis: (- (id Z)) . x = ((- 1) * x) + 0
(- (id Z)) . x = - ((id Z) . x) by VALUED_1:8
.= - x by A5, FUNCT_1:18
.= ((- 1) * x) + 0 ;
hence (- (id Z)) . x = ((- 1) * x) + 0 ; :: thesis: verum

end;

A6: for x being Real st x in Z holds
((- (id Z)) (#) cos) . x = - (x * (cos . x))

proof

let x be Real; :: thesis: ( x in Z implies ((- (id Z)) (#) cos) . x = - (x * (cos . x)) )
assume A7: x in Z ; :: thesis: ((- (id Z)) (#) cos) . x = - (x * (cos . x))
((- (id Z)) (#) cos) . x = ((- (id Z)) . x) * (cos . x) by VALUED_1:5
.= (((- 1) * x) + 0) * (cos . x) by A4, A7
.= - (x * (cos . x)) ;
hence ((- (id Z)) (#) cos) . x = - (x * (cos . x)) ; :: thesis: verum

end;

A8: for x being Real st x in dom (((- cos) - ((id Z) (#) sin)) `| Z) holds
(((- cos) - ((id Z) (#) sin)) `| Z) . x = ((- (id Z)) (#) cos) . x

proof

let x be Real; :: thesis: ( x in dom (((- cos) - ((id Z) (#) sin)) `| Z) implies (((- cos) - ((id Z) (#) sin)) `| Z) . x = ((- (id Z)) (#) cos) . x )
assume x in dom (((- cos) - ((id Z) (#) sin)) `| Z) ; :: thesis: (((- cos) - ((id Z) (#) sin)) `| Z) . x = ((- (id Z)) (#) cos) . x
then A9: x in Z by A3, FDIFF_1:def 7;
then (((- cos) - ((id Z) (#) sin)) `| Z) . x = - (x * (cos . x)) by Th19
.= ((- (id Z)) (#) cos) . x by A6, A9 ;
hence (((- cos) - ((id Z) (#) sin)) `| Z) . x = ((- (id Z)) (#) cos) . x ; :: thesis: verum

end;

dom ((- (id Z)) (#) cos) = (dom (- (id Z))) /\ REAL by SIN_COS:24, VALUED_1:def 4
.= dom (- (id Z)) by XBOOLE_1:28
.= dom (id Z) by VALUED_1:8 ;
then A10: Z = dom ((- (id Z)) (#) cos) by RELAT_1:45;
then dom (((- cos) - ((id Z) (#) sin)) `| Z) = dom ((- (id Z)) (#) cos) by A3, FDIFF_1:def 7;
then A11: ((- cos) - ((id Z) (#) sin)) `| Z = (- (id Z)) (#) cos by A8, PARTFUN1:5;
Z = (dom (- (id Z))) /\ (dom cos) by A10, VALUED_1:def 4;
then Z c= dom (- (id Z)) by XBOOLE_1:18;
then - (id Z) is_differentiable_on Z by A4, FDIFF_1:23;
then A12: ((- (id Z)) (#) cos) | Z is continuous by A10, A2, FDIFF_1:21, FDIFF_1:25;
then ((- (id Z)) (#) cos) | A is continuous by A1, FCONT_1:16;
then A13: (- (id Z)) (#) cos is_integrable_on A by A1, A10, INTEGRA5:11;
((- (id Z)) (#) cos) | A is bounded by A1, A10, A12, FCONT_1:16, INTEGRA5:10;
hence integral (((- (id Z)) (#) cos),A) = (((- cos) - ((id Z) (#) sin)) . (upper_bound A)) - (((- cos) - ((id Z) (#) sin)) . (lower_bound A)) by A1, A13, A11, Th19, INTEGRA5:13; :: thesis: verum