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Evaluate the Integral 0π/2cos7tcos6tdt\int _ { 0 } ^ { \pi / 2 } \cos 7 t \cos 6 t d t

Question 426

Multiple Choice

Evaluate the integral.
- 0π/2cos7tcos6tdt\int _ { 0 } ^ { \pi / 2 } \cos 7 t \cos 6 t d t


A) 911\frac { 9 } { 11 }
B) 713\frac { 7 } { 13 }
C) 711\frac { 7 } { 11 }
D) 613\frac { 6 } { 13 }

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