수악중독

\({\dfrac{\sin \theta}{\sin \theta \sin 2\theta}} +{\dfrac{\sin \theta}{\sin 2\theta \sin 3\theta}}+ \cdots +{\dfrac{\sin \theta}{\sin 99\theta \sin 100\theta}}\) 를 간단히 하면? ① \(\tan \theta - \tan \theta \cos \theta\) ② \(\cot \theta - \cot 100 \theta\) ③ \(\sin \theta - \sin 100\theta\) ④ \(\cos \theta \left ( \cot \theta - \cot 100 \theta \right )\) ⑤ \(\tan \theta \left ( \sin \theta - \sin 10..