Evaluate ∫0π/2zcos(z)dz\int_0^{\pi/2} z \cos(z) dz∫0π/2zcos(z)dz.
π/2−1\pi/2 - 1π/2−1
π/2+1\pi/2 + 1π/2+1
111
π−1\pi - 1π−1