Editor
If $y=(x^{2}+5)(x^{3}+7)$, then dy/dx equals:
Difficulty: Easy
A: 
$3x^{2}+12x+35$
B: 
$27x^{5}+35x^{3}+27$
C: 
$5x^{4}+15x^{2}+14x$
D: 
None
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