Solve cos(θ)=sin(θ)\cos(\theta) = \sin(\theta)cos(θ)=sin(θ) for θ∈[0,2π)\theta \in [0, 2\pi)θ∈[0,2π).
θ=π4,5π4\theta = \frac{\pi}{4}, \frac{5\pi}{4}θ=4π,45π
θ=π4,3π4\theta = \frac{\pi}{4}, \frac{3\pi}{4}θ=4π,43π
θ=π3,4π3\theta = \frac{\pi}{3}, \frac{4\pi}{3}θ=3π,34π
θ=π2,3π2\theta = \frac{\pi}{2}, \frac{3\pi}{2}θ=2π,23π