微积分,求答案
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(5)
F(x)= ∫(1->x) sint/t dt
F'(x) = sinx/x
F'(π/2 ) =2/π
(4)
∫(a->b) f'(2x) dx
=(1/2) [f(2x)]|(a->b)
=(1/2)[ f(2b)-f(2a) ]
(8)
∫(0->ln(x^2)) xe^x dx
=∫(0->ln(x^2)) xde^x
=[x.e^x]|(0->ln(x^2)) - ∫(0->ln(x^2)) e^x dx
=2x^2.lnx - [e^x]|(0->ln(x^2))
=2x^2.lnx - x^2 +1
F(x)= ∫(1->x) sint/t dt
F'(x) = sinx/x
F'(π/2 ) =2/π
(4)
∫(a->b) f'(2x) dx
=(1/2) [f(2x)]|(a->b)
=(1/2)[ f(2b)-f(2a) ]
(8)
∫(0->ln(x^2)) xe^x dx
=∫(0->ln(x^2)) xde^x
=[x.e^x]|(0->ln(x^2)) - ∫(0->ln(x^2)) e^x dx
=2x^2.lnx - [e^x]|(0->ln(x^2))
=2x^2.lnx - x^2 +1
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