Evaluate the Integral $$\int _ { \pi / 2 } ^ { 3 \pi / 2 } 21 \cos x d x$$

question 96

Multiple Choice

Evaluate the integral.
- $$\int _ { \pi / 2 } ^ { 3 \pi / 2 } 21 \cos x d x$$

• A) -42
• B) 21
• C) 42
• D) -21

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