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已知\(f(x) = \cos 2x\),则\(\mathop{\lim}\limits_{\Delta x\to 0}\frac {f(x+\Delta x)-f(x)} {\Delta x}=\)( )
A.\(\sin 2x\)
B.\( - \sin 2x\)
C.\(2\sin 2x\)
D.\( - 2\sin 2x\)
参考答案:D
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