Evaluate ∫0π/2cosxsinx+cosx dx\int_0^{\pi/2} \frac{\cos x}{\sin x + \cos x} \, dx∫0π/2sinx+cosxcosxdx using symmetry.
π4\frac{\pi}{4}4π
π2\frac{\pi}{2}2π
π\piπ
000