Editor
Derivate of $\sin(x)$ is
Difficulty: Easy
A: 
$-\cos(x)$
B: 
$\cos(x)$
C: 
${\rm{cose}}{{\rm{c}}}\left( x \right)$
D: 
$-{\rm{cose}}{{\rm{c}}}\left( x \right)$
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