Question

The value of the definite integral $\underset{0}{\overset{\pi /2}{\int }}\left({\cos }^{5}x\right)\sin (7x)dx$ is equal to

• A. $\frac{1}{5}$
• B. $\frac{1}{6}$
• C. $\frac{1}{7}$
• D. $\frac{1}{8}$

Answer 1

Answer: (B)

Correct answer is (b) $\frac{1}{6}$