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8、A
a/x^2-b/sinx*x
=(asinx-bx)/(sinx*x^2)
等价替换
=(asinx-bx)/(x^3)
洛必达
=(acosx-b)/(3x^2)
等价替换
=(a(1-0.5x^2)-b)/(3x^2)
=(-0.5ax^2+a-b)/3(x^2)
=>
-0.5a/3=-1/6
a-b=0
a/x^2-b/sinx*x
=(asinx-bx)/(sinx*x^2)
等价替换
=(asinx-bx)/(x^3)
洛必达
=(acosx-b)/(3x^2)
等价替换
=(a(1-0.5x^2)-b)/(3x^2)
=(-0.5ax^2+a-b)/3(x^2)
=>
-0.5a/3=-1/6
a-b=0
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