(1)
åå¼=[1/2·x²-1/(2x²)] |(1â3)
=40/9-0
=40/9
(2)
åå¼=arctanx |(-1â1)
=Ï/4-(-Ï/4)
=Ï/2
(3)
åå¼=â«(0â2)(1+e^x)dx
=(x+e^x) |(0â2)
=2+e^2-1
=1+e^2
(4)
åå¼=2â«(0âÏ/2)sin²(x/2)dx
=â«(0âÏ/2)(1-cosx)dx
=(x-sinx) |(0âÏ/2)
=Ï/2-1-0
=Ï/2-1
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