β«02Οβx3cosxdx=x3sinxβ£β£β02Οβββ«02Οβ3x2sinxdx=β3β£β‘ββx2cosxβ£β£β02Οβ+2β«02Οβxcosxdxβ¦β€β=β3β£β‘ββ4Ο2+2βββxsinxβ£β£β02Οβββ«02Οβsinxdxβ βββ¦β€β=β3[β4Ο2+2(cosxβ£β£β02Οβ)]=β3[β4Ο2+2]=12Ο2β6
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