A particle's position is s(t)=sin(t)+cos(t)s(t) = \sin(t) + \cos(t)s(t)=sin(t)+cos(t). At what time t∈[0,π]t \in [0, \pi]t∈[0,π] is the velocity zero?
π/4\pi/4π/4
π/2\pi/2π/2
π/3\pi/3π/3
3π/43\pi/43π/4