高等数学定积分求解
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3、令x=sint,则dx=costdt
原式=∫(0,π/2) cos^2tdt
=(1/2)*∫(0,π/2) (1+cos2t)dt
=(1/2)*[t+(1/2)*sin2t]|(0,π/2)
=π/4
4、令x=sint,则dx=costdt
原式=∫(0,π/2) sintcos^2tdt
=-∫(0,π/2) cos^2td(cost)
=-(1/3)*cos^3t|(0,π/2)
=1/3
原式=∫(0,π/2) cos^2tdt
=(1/2)*∫(0,π/2) (1+cos2t)dt
=(1/2)*[t+(1/2)*sin2t]|(0,π/2)
=π/4
4、令x=sint,则dx=costdt
原式=∫(0,π/2) sintcos^2tdt
=-∫(0,π/2) cos^2td(cost)
=-(1/3)*cos^3t|(0,π/2)
=1/3
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