Answer: 2.
- A 0
- B 1
- C 2
- D pi
Correct answer: C. 2
Explanation: [-cos x] from 0 to pi = -cos(pi) - (-cos 0) = -(-1) + 1 = 2.
The exact area under the curve from a to b (shaded) is approximated by a few rectangles, the Riemann sum idea behind the definite integral.