θ=(4n−1)π4\theta=(4 n-1) \frac{\pi}{4}θ=(4n−1)4π
θ=(2n+1)π4\theta=(2 n+1) \frac{\pi}{4}θ=(2n+1)4π
θ=(2n−1)π4\theta=(2 n-1) \frac{\pi}{4}θ=(2n−1)4π
θ=(4n+1)π4\theta=(4 n+1) \frac{\pi}{4}θ=(4n+1)4π