Question
$\int_0^{\pi /2} {\,\,\,\,\,|\sin x - \cos x|\,dx = } $
$ = \int_0^{\pi /4} { - (\sin x - \cos x} )dx + \int_{\pi /4}^{\pi /2} {\,(\sin x - \cos x)dx} $
$= 2(\sqrt 2 - 1)$.
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