Evaluate the Integral $$\int _ { \pi / 4 } ^ { 3 \pi / 4 } 9 \csc ^ { 2 } x d x$$

question 271

Multiple Choice

Evaluate the integral.
- $$\int _ { \pi / 4 } ^ { 3 \pi / 4 } 9 \csc ^ { 2 } x d x$$

• A) 18
• B) 9
• C) 0
• D) -18

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