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Basic Identities
Definition of tangent $ \tan \theta = \frac{\sin \theta}{\cos\theta} $ credit
Definition of cotangent $ \cot \theta = \frac{\cos \theta}{\sin\theta} $ credit
place note here place formula here
place note here place formula here

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Sees the importance of signal filtering in medical imaging

Dhruv Lamba, BSEE2010