求定积分数学题?
2个回答
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(1)
∫(e^x-3cosx)dx (积分范围0→π/2)
=e^x-3sinx (积分范围0→π/2)
=e^(π/2)-3-(1-0)
=e^(π/2)-4
(2)
∫sin(2x+π/3)dx (积分范围π/6→π/2)
=-0.5*cos(2x+π/3) (积分范围π/6→π/2)
=-0.5*cos(2*π/2+π/3)+0.5*cos(2*π/6+π/3)
=1/4-1/4
=0
∫(e^x-3cosx)dx (积分范围0→π/2)
=e^x-3sinx (积分范围0→π/2)
=e^(π/2)-3-(1-0)
=e^(π/2)-4
(2)
∫sin(2x+π/3)dx (积分范围π/6→π/2)
=-0.5*cos(2x+π/3) (积分范围π/6→π/2)
=-0.5*cos(2*π/2+π/3)+0.5*cos(2*π/6+π/3)
=1/4-1/4
=0
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