$ = \displaystyle\lim_{x \to 0} \frac{2sinx -2sinxcosx}{x^3} = $
$ = \displaystyle\lim_{x \to 0} \frac{2sinx( 1 - cosx)}{x^3} = $
$ = \displaystyle\lim_{x \to 0} 2 \frac{sinx}{x}\cdot\frac{1 - cosx}{x^2} = 1$
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