Question Number 80846 by TawaTawa last updated on 07/Feb/20 Commented by mathmax by abdo last updated on 07/Feb/20 $${we}\:{havw}\:\int_{−\pi} ^{\pi} {costdt}\:=\mathrm{2}\int_{\mathrm{0}} ^{\pi} {cost}\:{dt}\:=\mathrm{2}\left[{sint}\right]_{\mathrm{0}} ^{\pi} =\mathrm{0}…
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