A particle's position is s(t)=sin(t)−cos(t)s(t) = \sin(t) - \cos(t)s(t)=sin(t)−cos(t). Find the time t∈[0,2π]t \in [0, 2\pi]t∈[0,2π] when the acceleration is zero.
t=π/4,5π/4t = \pi/4, 5\pi/4t=π/4,5π/4
t=3π/4,7π/4t = 3\pi/4, 7\pi/4t=3π/4,7π/4
t=0,πt = 0, \pit=0,π
t=π/2,3π/2t = \pi/2, 3\pi/2t=π/2,3π/2