第六题怎么做,谢谢
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∫(0->π/2) e^(2x). cosx dx
=∫(0->π/2) e^(2x) dsinx
= [ sinx .e^(2x) ]|(0->π/2) - 2∫(0->π/2) e^(2x) .sinx dx
=e^π + 2∫(0->π/2) e^(2x) dcosx
=e^π + 2[cosx.e^(2x)]|(0->π/2) -4∫(0->π/2) e^(2x) .cosx dx
=e^π - 2 -4∫(0->π/2) e^(2x) .cosx dx
5∫(0->π/2) e^(2x). cosx dx = e^π -2
∫(0->π/2) e^(2x). cosx dx = (1/5)( e^π - 2)
=∫(0->π/2) e^(2x) dsinx
= [ sinx .e^(2x) ]|(0->π/2) - 2∫(0->π/2) e^(2x) .sinx dx
=e^π + 2∫(0->π/2) e^(2x) dcosx
=e^π + 2[cosx.e^(2x)]|(0->π/2) -4∫(0->π/2) e^(2x) .cosx dx
=e^π - 2 -4∫(0->π/2) e^(2x) .cosx dx
5∫(0->π/2) e^(2x). cosx dx = e^π -2
∫(0->π/2) e^(2x). cosx dx = (1/5)( e^π - 2)
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