First slide

Evaluation of definite integrals

Question

$\int_{π}^{10 π} | \sin x | d x =$

Difficult

A

29
B

8
C

10
D

18

Solution

$| \sin x |$ is periodic with period $π$
$∴ I = 9 \int_{0}^{π} \sin x d x = 18$

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