Evaluate the Integral $$\int _ { 0 } ^ { \pi / 2 } \cos 5 t \cos 4 t d t$$

question 114

Multiple Choice

Evaluate the integral.
- $$\int _ { 0 } ^ { \pi / 2 } \cos 5 t \cos 4 t d t$$

• A) \(\frac { 5 } { 7 }\)
• B) \(\frac { 5 } { 9 }\)
• C) \(\frac { 4 } { 9 }\)
• D) 1

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