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The slope of the tangent to the curve $y = f(x)$ at the point $x = a$ is:
A$\dfrac{1}{f'(a)}$
B$f(a)$
C$-\dfrac{1}{f'(a)}$
D$f'(a)$
Answer & Solution
Correct answer: D. $f'(a)$
The derivative f'(a) is the slope of the tangent at x = a.
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