Answer: 1.
- A 1
- B 0
- C infinity
- D undefined
Correct answer: A. 1
Explanation: This is a standard limit: lim (x→0) (sin x)/x = 1.
As point Q slides along the curve toward P, the secant line PQ rotates into the tangent line at P, whose slope is the derivative.
Concept context
Rate of change, differentiation rules, and applications