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Prove that sin(2theta)/(1-cos2theta)=cot...

Prove that `sin(2theta)/(1-cos2theta)=cot theta`

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To prove that \[ \frac{\sin(2\theta)}{1 - \cos(2\theta)} = \cot(\theta) \] we will start with the left-hand side and simplify it step by step. ...
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