let Z be open Subset of REAL ; :: thesis: ( Z c= ].(- 1),1.[ implies ( exp_R (#) (arctan - arccot ) is_differentiable_on Z & ( for x being Real st x in Z holds
((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) ) ) )
assume A1: Z c= ].(- 1),1.[ ; :: thesis: ( exp_R (#) (arctan - arccot ) is_differentiable_on Z & ( for x being Real st x in Z holds
((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) ) )
then A2: arctan - arccot is_differentiable_on Z by Th38;
A3: ].(- 1),1.[ c= [.(- 1),1.] by XXREAL_1:25;
then ].(- 1),1.[ c= dom arccot by SIN_COS9:24, XBOOLE_1:1;
then A4: Z c= dom arccot by A1, XBOOLE_1:1;
].(- 1),1.[ c= dom arctan by A3, SIN_COS9:23, XBOOLE_1:1;
then Z c= dom arctan by A1, XBOOLE_1:1;
then Z c= (dom arctan ) /\ (dom arccot ) by A4, XBOOLE_1:19;
then A5: Z c= dom (arctan - arccot ) by VALUED_1:12;
then Z c= (dom exp_R ) /\ (dom (arctan - arccot )) by TAYLOR_1:16, XBOOLE_1:19;
then A6: Z c= dom (exp_R (#) (arctan - arccot )) by VALUED_1:def 4;
A7: exp_R is_differentiable_on Z by FDIFF_1:34, TAYLOR_1:16;
for x being Real st x in Z holds
((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 )))

proof

let x be Real; :: thesis: ( x in Z implies ((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) )
assume A8: x in Z ; :: thesis: ((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 )))
then ((exp_R (#) (arctan - arccot )) `| Z) . x = (((arctan - arccot ) . x) * (diff exp_R ,x)) + ((exp_R . x) * (diff (arctan - arccot ),x)) by A6, A7, A2, FDIFF_1:29
.= (((arctan . x) - (arccot . x)) * (diff exp_R ,x)) + ((exp_R . x) * (diff (arctan - arccot ),x)) by A5, A8, VALUED_1:13
.= (((arctan . x) - (arccot . x)) * (exp_R . x)) + ((exp_R . x) * (diff (arctan - arccot ),x)) by TAYLOR_1:16
.= (((arctan . x) - (arccot . x)) * (exp_R . x)) + ((exp_R . x) * (((arctan - arccot ) `| Z) . x)) by A2, A8, FDIFF_1:def 8
.= (((arctan . x) - (arccot . x)) * (exp_R . x)) + ((exp_R . x) * (2 / (1 + (x ^2 )))) by A1, A8, Th38
.= ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) ;
hence ((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) ; :: thesis: verum

end;

hence ( exp_R (#) (arctan - arccot ) is_differentiable_on Z & ( for x being Real st x in Z holds
((exp_R (#) (arctan - arccot )) `| Z) . x = ((exp_R . x) * ((arctan . x) - (arccot . x))) + ((2 * (exp_R . x)) / (1 + (x ^2 ))) ) ) by A6, A7, A2, FDIFF_1:29; :: thesis: verum