Question

$\int 4\sin x\cos \frac{x}{2}\cos \frac{3x}{2}dx$ is equal to -

• A. $\cos x-\frac{1}{2}\cos 2x+\frac{1}{3}\cos 3x+c$
• B. $\cos x-\frac{1}{2}\cos 2x-\frac{1}{3}\cos 3x+c$
• C. $\cos x+\frac{1}{2}\cos 2x+\frac{1}{3}\cos 3x+c$
• D. $\cos x+\frac{1}{2}\cos 2x-\frac{1}{3}\cos 3x+c$

Answer 1

Answer: (B)

Correct answer is (b) $\cos x-\frac{1}{2}\cos 2x-\frac{1}{3}\cos 3x+c$