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$\frac{\text{d}}{\text{d}x}[f(x)g(x)]$=
Difficulty: Easy
A: 
f'(x)g'(x)
B: 
f(x)g'(x)+g(x)f'(x)
C: 
f(x)+g(x)
D: 
f(x)[f'(x)+g'(x)]
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