Editor
$\int_{a}^{b} f(x)dx$ is equal to:
Difficulty: Easy
A: 
$-\int_{a}^{b}f(x)dx$
B: 
$-\int_{b}^{a}f(x)dx$
C: 
$\int_{b}^{a}\frac{1}{f(x)}dx$
D: 
$-\int_{a}^{b}\frac{1}{f(x)}dx$
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