d d x c f ( x ) = c ( d d x f ( x ) ) \frac{d}{dx} cf(x)=c(\frac{d}{dx} f(x)) dxdcf(x)=c(dxdf(x)). 例子. d d x 4 sin x \frac{d}{dx} 4\sin{x} dxd4sinx.
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