Question

if $∫_{-1}^1 \frac{cos \, \alpha x}{1+3^x} dx = \frac2{\pi}$ then $\alpha$ is

• A. π/6
• B. π/2
• C. π/3
• D. π

Answer 1

Answer: (B)

π/2

Answer 2

The Correct answer is option(B) : π/2