设函数f(x)在x=0点连续 且满足limx->0(sinx/x^2+f(x)/x)=2求f'(0)

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设函数f(x)在x=0点连续 且满足limx->0(sinx/x^2+f(x)/x)=2求f'(0)

设函数f(x)在x=0点连续 且满足limx->0(sinx/x^2+f(x)/x)=2求f'(0)
设函数f(x)在x=0点连续 且满足limx->0(sinx/x^2+f(x)/x)=2求f'(0)

设函数f(x)在x=0点连续 且满足limx->0(sinx/x^2+f(x)/x)=2求f'(0)
∵limx->0(sinx/x^2+f(x)/x)
=limx->0[sinx+xf(x)]/x^2
=limx->0[cosx+f(x)+xf'(x)]/(2x)
=1/2limx->0[cosx+f(x)+xf'(x)]/x
=2
limx->0[cosx+f(x)+xf'(x)=0
limx->0f(x)=-1
limx->0[cosx+f(x)]/x
=limx->0[-sinx+f'(x)]=f'(x)
∴limx->0[cosx+f(x)+xf'(x)]/x
∴limx->0[cosx+f(x)]/x+limx-->0f'(x)
=2f'(0)
=4
∴f'(0)=2

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