Evaluate the definite integral: int_{0}^{pi} sin x dx.
Answer and explanation
Correct answer: A. 2
- Step 1: A primitive function of sin x is -cos x. Step 2. [-cos x] from 0 to pi = -cos(pi) - (-cos 0) = 1 + 1 = 2. Answer: 2. Why not the others: 0 uses cos x as the primitive function, -2 has the sign of the primitive function wrong, and 1 evaluates only one of the two limits.
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