y=f(x)由方程x3+y2-sinx+6y=0确定的,则dy∣x=0=____.
(1/6)dz。 当x=0时,y3+6y=0,得y=0. 又方程两边求导得3x2+3y2•y′-cosx+6y′,=0, 所以y′(0)=1/6,故dy∣x=0=y′(0)dx=(1/6)dx.
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