allerySlope of tangent to y = f(x) at point (a, f(a)) is:
Af(a)
B1/f'(a)
Cf''(a)
Df'(a) (derivative at the point)
Answer & Solution
Correct answer: D. f'(a) (derivative at the point)
Derivative f'(a) is the slope of the tangent line at x = a.
**Equation of tangent:** y - f(a) = f'(a)(x - a).
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