Simplify sin(3θ)sinθ−cos(3θ)cosθ\frac{\sin(3\theta)}{\sin \theta} - \frac{\cos(3\theta)}{\cos \theta}sinθsin(3θ)−cosθcos(3θ).
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cos(2θ)\cos(2\theta)cos(2θ)
sin(2θ)\sin(2\theta)sin(2θ)