alleryFor a constant $c$, $\dfrac{d}{dx}\big(c\,f(x)\big)$ equals:
A$c$
B$c\,f'(x)$
C$f'(x)$
D$c + f'(x)$
Answer & Solution
Correct answer: B. $c\,f'(x)$
The constant-multiple rule: d/dx(c·f) = c·f'(x).
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