j) \frac{\sin x}{\cos x} = \frac{\sin x}{1 + \sin x} k) \frac{5 \cos^2 \theta - \cos \theta \sin \theta - 3}{2 \cos^2 \theta - 3 \cos \theta \sin \theta} = \frac{\cos \theta + \sin \theta}{\cos \theta} m) \frac{}{\sin x - 1} o) \frac{}{1 + \sin x}
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