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\( \DeclareMathOperator{\abs}{abs} \newcommand{\ensuremath}[1]{\mbox{$#1$}} \)
(%i1)
integrate
(
sin
(
x
)·
sin
(
x
),
x
,
−
%pi
,
%pi
)
;
\[\tag{%o1} \ensuremath{\pi} \]
(%i10)
integrate
(
−
sin
(
x
)·
sin
(
x
),
x
,
−
%pi
,
%pi
)
;
\[\tag{%o10} -\ensuremath{\pi} \]
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wxMaxima
.