Understand and be able to use tanθ=sinθcosθ\tan{θ} = \dfrac{\sin{θ}}{\cos{θ}}tanθ=cosθsinθe.g. solve sinθ=3cosθ\sin{θ} = 3\cos{θ}sinθ=3cosθ for 0°≤θ≤360°0° \le θ \le 360°0°≤θ≤360°.
