Rewrite in terms of sine and cosine, and simplify the expression: [ frac{cos eta-cot eta cos eta-cos eta sin eta}{cos eta cot eta} ]
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So, the expression becomes: \[ \frac{\cos \beta-\frac{\cos^2 \beta}{\sin \beta}-\cos \beta \sin \beta}{\frac{\cos^2 \beta}{\sin \beta}} \] Show more…
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